Age (weeks) 3-14. Socialization Period. If socialization later than 14 weeks, (or
between 12-14 weeks in some dogs) shyness or aggressiveness may dominate behavior.
Age (weeks) 6-8. Optimum Socialization. If socialization earlier, shyness often
develops, alone with over-dependence on owner, which may lead to over
protectiveness.
Age (weeks) 8-10. Fear Imprint. Traumatic, fear producing experiences may bee
permanently impressed causing defensive reactions in some circumstances.
Age (weeks) 12-14. Puberty Onset. Meaningful sexual mounting often occurs. Males
display erections.
Age (weeks) 18-40. Protective-Aggressive. Barking at strangers and other territorial
and social group protective tendencies may occur. Leg lifting may begin in males.
Age (weeks) 35-56. Functional. Many dogs become more serious about protective-
aggressive behavior. A general persistence in behavior problems is noted and
corrections become more difficult.
Age (weeks) 104-208. Achievement. Protective -aggressive behavior can become
especially purposeful. Problem behavior appears to become self rewarding, habitual.
Corrections markedly more difficult.
______________________________________________________________________
__
Critical Stages of Canine Development
The notion of critical stages of canine development has been well covered in both
scientific and popular literature and is based primarily on the work of John Scott and J.
L. Fuller in the forties, fifties, and sixties. Clarence Pfaffenberger’s book NEW
KNOWLEDGE O DOG BEHAVIOR introduced these stages of development to
breeders, trainers, and pet owners over 20 years ago. Jack and Wendy Vollhard and
Richard Wolters further popularized this field by introducing puppy aptitude testing
based, in part, on Scott and Fuller’s findings. Drs Michael Fox and Iam Dunbar, initially
studying canine development and behavior in clinical settings, have written copiously
for the lay press regarding puppy socialization.
Unfortunately, many other writers unfamiliar with the original research have led new
puppy owners into believing that a puppy purchased an age older than exactly 7 weeks
will bond less well and be less trainable than a puppy purchased at exactly 49 days of
life.
This “urban myth” is most vexing to breeders as the 49th day of life may be the earliest
time a puppy may leave its litter mates, but may not be the best time. So here to debunk
some of these myths is a synopsis is the critical periods of puppy development from a
breeders point of view:
FIRST PERIOD–BIRTH-21 DAYS
A. Neonatal sub period 0-13 days
Characters: Puppies are “fetuses out of the womb.” They can not see, hear, regulate
their own body temperature, or climate without stimulation and are totally dependant
upon their dam or segregate mother.
No emotional development, social attachment, or learning takes place during this
period. Puppies brain waves remain constant whether sleeping or awake. Puppies do,
however, exhibit reflex reactions to hunger, cold, touch. They pile for warmth or spread
out if too hot but cannot regulate their own temperature by shivering or panting.
During this neonatal period puppies will crawl backward and forward and will swing
their heads from side to side, often repetitively while mewing or trilling. These
movements appear to be involuntary and prepare pups muscles, nervous system, and
inner ear for further development.
Breeder Do’s: Keep bitch happy, healthy and well-fed. Her physical and emotional well
being will supply everything the puppies need during this stage.
Handle puppies very gently with very slow massaging movements. Very light
stimulation of the nervous system (“called pre-stressing”) may be beneficial when
applied during the second week of life. This could involve rotating the pups gently in
your hands, applying light pressure to the ear leather, and holding each pup gently on its
back for a few seconds each day. Pups should, of course, be weighed daily to monitor
growth and this would be a good time to handle each pup. THIS IS NOT
SOCIALIZATION OR TRAINING. Pre-stress does, however, assist in developing brain
cells.
Breeder Dont's: Don’t allow visitors (human or canine) during this period. Avoid
anything that will stress the bitch (house guest, parties, home repairs, etc...) Also try not
to move puppies or remove mother from the litter at this time. If the pups or dam need
to see a veterinarian try to arrange for a home visit. Despite the common practice, this
is not a good age to take a litter to a dog show in you van, tailor or motor home.
B. Transition Sub Period 13-21 days.
Characteristics; Eyes and ears open and pups slowly begin responding to light,
movement and sound. Puppies become more mobile as they gain awareness of their
surroundings, their mother, litter mates, and objects. Pups may also begin to alert to
human presence during this period. This is still a reaction to stimuli rather than a social
bond or emotional attachment.
Pups will attempt to get up on their feet, but continue crawling backward and forward.
They may begin trying to get out of whelping box toward the end of this period.
Breeder Do’s: Introduce toys as obstacles to climb over or bump into. This helps pups
develop spatial awareness. Some pups may begin briefly interacting with toys near the
end of the third week. Continue handling pups daily using slow, massaging movements.
Pups are growing fast and need frequent nail trimming. Introducing brushing with soft
brush. Again, this is not training but stimulation.
Breeder Dont's: Avoid startling pup with loud noises or sudden movements while
hearing and eyesight are developing. If you must move or change puppies environment,
this is the time to do so. Do not remove dam.
SECOND PERIOD 21-28 DAYS
Characteristics; Most important period with rapid sensory development. Puppies are
fully alert to their environment and will startle easily at sudden sounds and movements.
During this time they are able to recognize their breeder and other significant humans
by smell, sight and sound. However, they have lost the natural insulation of the
neonatal period and negative events can easily imprint basic behavior during this period.
Social bonding begins to occur during this week.
Neonatal behaviors such as head swinging, mewing and crawling back and forth stop.
Pups are more active and moving well on their feet. This is a time of rapid physical
change. There are also significant changes in brain waves during this period and pups
are now able to learn from experience and to retain what they have learned.
Breeders Do’s: Introduce new tactile sensations in puppies box pups enjoy borrowing in
shredded newspaper, for example, or crawling over a rolled towel or blanket. Continue
daily handling, adding new sounds and sights to the environment radio, TV, telephone,
computer and printer. Introduce toys and make sounds. Pups can be removed from the
box and placed on new surfaces. Do this with two pups at a time rather than separating
from litter.
Breeder Dont's: AVOID LOUD NOISES OR SUDDEN CHANGES DURING THIS
PERIOD. Negative events can permanently imprint on the pups during this week. Do
not run vacuum cleaner around pups, blow hair dryers, run clippers etc. Postpone
having work done on your home and ask prospective purchasers or curious friends to
wait to the end of the 4th week to visit puppies.
Do not move puppies or separate from dam during this week.
THIRD PERIOD 21-49 DAYS
Characteristics: Social awareness, learning to become dogs (note: first week of this
critical stage of develops overlaps with second period of development). Play fighting
behavior becomes increasingly intense. Pups are developing problem solving abilities,
physical coordination, bit inhibition. Mother begins weaning pups during this period,
those beginning to initiate discipline. During this time puppies will begin to move to the
far corners of their bed, box or pen to urinate and defecate.
House breaking can begin!
Breeder Do’s: During entire period leave pups together as litter and allow dam free
access to pups.
During 4th week (21-28 days) introduce food to pups without removing the dam. You
can feed her in the litter box at the same time. Begin escalating sensory experience (see
notes on critical period). Continue daily handling by breeder and family members.
During 5th week (28-35 days) Introduce pups to the outdoors. Take them outside to
urinate and defecate after drinking or eating. When this is not possible provide pups
with a designed bathroom spot to begin the housebreaking.
Begin handling pups individually away from litter mates and dam for at least 10 minutes
each day. Enlist the help of family members, friends, neighbors and prospective puppy
owner in this process. If you cannot handle 10 minutes each day, do 5 minutes. Daily
experiences away from litter mates are crucial.
During the 6th and 7th weeks (35-49 days) Increase sensory experiences with brief car
rides. Introduce pups to vacuum cleaner. Puppies can begin simple training routines
using food lures and social attraction at this time. Start teaching pups to stand on
grooming table to be examines or to be brushed.
This is the prime socialization periods. Introduce new people, especially children. Pups
enjoy interaction with a gentle adult dog kindly auntie or uncle who will baby-sit with
patience.
Introducing situations that will stimulate problem solving behavior- - tunnels, cardboard
boxes, gates. steps, fences, logs, etc. Allow pups to have successes and reinforce these
successes wit food.
Breeder Dont's: DO NOT REMOVE PUPPIES FROM LITTER DURING THIS
PERIOD!! Do not completely remove mother. Do not correct for play fighting,
housebreaking errors, or mouthing.
FORTH PERIOD 49 DAYS TO 12 WEEKS
Characteristics: Enlarging social awareness and bonding outside of litter. Mental
abilities are fully formed but pups lack experience. This is the optimum time to teach
new things and is, in fact, the period of fastest learning. Research has shown that
behaviors can be shaped and modified most easily during times when learning is
occurring most quickly. Training during this time will actually increase the capacity to
learn by increasing brain cells in the appropriate regions of the brain.
Bladder and bowel control developed and pups are capable of sleeping through the
night without accidents.
Breeder Do’s: Greatly enlarge the puppies world between 49 and 56 days. Begin puppy
rotation, playing and sleeping in smaller groups. Pups that remain with breeder cam be
created with one or two other pups. Be sure to switch puppies around.
Continue individual grooming, play and training sessions with each pup. Gentle but firm
discipline from humans may be begun. Begin teaching response to simple commands
such as sit, down, stand, come, walk on lead at this time. Pups during this period can
learn complex behavior chain and can make associations.
Breeder Dont's: Do not isolate from humans or unnecessarily restrain during this period
(only restraints should be crate or necessary fencing). Avoid inadvertently reinforcing
fearful responses.
NOTE: FIRST FEAR IMPRINT PERIOD OCCURS BETWEEN 8-10 WEEKS,
AVOID PLACING PUPS DURING THIS TIME. AVOID SHIPPING PUPS, EAR
CROPPING OR ANY TRAUMATIC EXPERIENCES.
Pups that have been properly socialized and bonded with breeder can be successfully
placed at 10-12 weeks after they have passed the fear imprint period and while they are
still young enough to be “ babies”.
FIFTH PERIOD 3-4 MONTHS
Characteristics: Dominance period where pup solidifies position. Pups will begin testing
their place in the world during this time. They tend to become emboldened. This is a
period of very fast physical growth.
Breeder/Owner Do’s: Pups must be treated as individual dogs. If they are still with the
breeder they should no longer be treated as part of a litter and should sleep alone in
individual crates at night and all training and grooming sessions should be individual.
Introduce behavioral dominance exercises, “Alphabetize” yourself and your family -
feed pup after you eat, move crate to different locations so pup doesn't’t become site
protective, take food and toys away while pup is eating or playing.
Continue socialization and obedience training providing slight distractions. TEACH
THE RECALL AND PRACTICE IT SEVERAL TIMES EVERY SINGLE DAY!!!! Do
this before pup enters the “flight period” at about age of 16 weeks.
Breeder/Owner Dont's: No tug of war games. Do not allow pup to sleep in bed with
humans. Absolutely forbid all chasing games with children.
VERY, VERY IMPORTANT NOTE: DO NOT RAISE LITTER MATES OR TWO
UNRELATED PUPPIES TOGETHER DURING THIS PERIOD!!!
SIXTH PERIOD 4-6 MONTHS
Characteristics: The flight period, corresponding to teething. Pups begin testing limits.
May attempt to assert dominance over human pack members (especially children). May
“forget” housebreaking.
This period is characterized by independence and willfulness. Owner or breeder is no
longer Mommy substitute.
Breeder/ Owner Do’s: Keep pup on lead when outside fenced enclosures. Continue
recall training and response to commands. Continue dominance exercises and handling
all parts of pups body.
Breeder/ Owner Don’ts: Do not let pup off lead if at all possible. Do not chase pup or
play chasing games.
SECOND FEAR IMPRINT PERIOD 6-14 MONTHS
Characteristics: Sexual maturity, hormonal changes. Fearfulness of new situations,
objects, people, other dogs. Male doge begin lifting legs.
Some individuals will pass through this periods faster than others, often with no
noticeable problems. Others may display marked changes in behavior in strange
situations.
Reinforce the behaviors you want: do not reinforce fearfulness by coddling to
protective behavior. But also try to avoid punishing fearfulness. Try to adopt a firm but
patient and kindly attitude to the pup’s fearful behavior. Continue socialization to
humans and other dogs. Avoid or postpone extremely stressful or traumatic experience
for the animals that appear to be in the fear imprint period.
NOTE: This primer on critical stages of development is an attempt to consolidate
information appearing in a variety of publications from a number of authors, and to
tailor that information specifically to the needs of breeders.
Remember that consistency and PRAISE are the key words here.
Thank you Carol for sharing in your knowledge and helping us to understand the
different stages in a puppies brain development.
between 12-14 weeks in some dogs) shyness or aggressiveness may dominate behavior.
Age (weeks) 6-8. Optimum Socialization. If socialization earlier, shyness often
develops, alone with over-dependence on owner, which may lead to over
protectiveness.
Age (weeks) 8-10. Fear Imprint. Traumatic, fear producing experiences may bee
permanently impressed causing defensive reactions in some circumstances.
Age (weeks) 12-14. Puberty Onset. Meaningful sexual mounting often occurs. Males
display erections.
Age (weeks) 18-40. Protective-Aggressive. Barking at strangers and other territorial
and social group protective tendencies may occur. Leg lifting may begin in males.
Age (weeks) 35-56. Functional. Many dogs become more serious about protective-
aggressive behavior. A general persistence in behavior problems is noted and
corrections become more difficult.
Age (weeks) 104-208. Achievement. Protective -aggressive behavior can become
especially purposeful. Problem behavior appears to become self rewarding, habitual.
Corrections markedly more difficult.
______________________________________________________________________
__
Critical Stages of Canine Development
The notion of critical stages of canine development has been well covered in both
scientific and popular literature and is based primarily on the work of John Scott and J.
L. Fuller in the forties, fifties, and sixties. Clarence Pfaffenberger’s book NEW
KNOWLEDGE O DOG BEHAVIOR introduced these stages of development to
breeders, trainers, and pet owners over 20 years ago. Jack and Wendy Vollhard and
Richard Wolters further popularized this field by introducing puppy aptitude testing
based, in part, on Scott and Fuller’s findings. Drs Michael Fox and Iam Dunbar, initially
studying canine development and behavior in clinical settings, have written copiously
for the lay press regarding puppy socialization.
Unfortunately, many other writers unfamiliar with the original research have led new
puppy owners into believing that a puppy purchased an age older than exactly 7 weeks
will bond less well and be less trainable than a puppy purchased at exactly 49 days of
life.
This “urban myth” is most vexing to breeders as the 49th day of life may be the earliest
time a puppy may leave its litter mates, but may not be the best time. So here to debunk
some of these myths is a synopsis is the critical periods of puppy development from a
breeders point of view:
FIRST PERIOD–BIRTH-21 DAYS
A. Neonatal sub period 0-13 days
Characters: Puppies are “fetuses out of the womb.” They can not see, hear, regulate
their own body temperature, or climate without stimulation and are totally dependant
upon their dam or segregate mother.
No emotional development, social attachment, or learning takes place during this
period. Puppies brain waves remain constant whether sleeping or awake. Puppies do,
however, exhibit reflex reactions to hunger, cold, touch. They pile for warmth or spread
out if too hot but cannot regulate their own temperature by shivering or panting.
During this neonatal period puppies will crawl backward and forward and will swing
their heads from side to side, often repetitively while mewing or trilling. These
movements appear to be involuntary and prepare pups muscles, nervous system, and
inner ear for further development.
Breeder Do’s: Keep bitch happy, healthy and well-fed. Her physical and emotional well
being will supply everything the puppies need during this stage.
Handle puppies very gently with very slow massaging movements. Very light
stimulation of the nervous system (“called pre-stressing”) may be beneficial when
applied during the second week of life. This could involve rotating the pups gently in
your hands, applying light pressure to the ear leather, and holding each pup gently on its
back for a few seconds each day. Pups should, of course, be weighed daily to monitor
growth and this would be a good time to handle each pup. THIS IS NOT
SOCIALIZATION OR TRAINING. Pre-stress does, however, assist in developing brain
cells.
Breeder Dont's: Don’t allow visitors (human or canine) during this period. Avoid
anything that will stress the bitch (house guest, parties, home repairs, etc...) Also try not
to move puppies or remove mother from the litter at this time. If the pups or dam need
to see a veterinarian try to arrange for a home visit. Despite the common practice, this
is not a good age to take a litter to a dog show in you van, tailor or motor home.
B. Transition Sub Period 13-21 days.
Characteristics; Eyes and ears open and pups slowly begin responding to light,
movement and sound. Puppies become more mobile as they gain awareness of their
surroundings, their mother, litter mates, and objects. Pups may also begin to alert to
human presence during this period. This is still a reaction to stimuli rather than a social
bond or emotional attachment.
Pups will attempt to get up on their feet, but continue crawling backward and forward.
They may begin trying to get out of whelping box toward the end of this period.
Breeder Do’s: Introduce toys as obstacles to climb over or bump into. This helps pups
develop spatial awareness. Some pups may begin briefly interacting with toys near the
end of the third week. Continue handling pups daily using slow, massaging movements.
Pups are growing fast and need frequent nail trimming. Introducing brushing with soft
brush. Again, this is not training but stimulation.
Breeder Dont's: Avoid startling pup with loud noises or sudden movements while
hearing and eyesight are developing. If you must move or change puppies environment,
this is the time to do so. Do not remove dam.
SECOND PERIOD 21-28 DAYS
Characteristics; Most important period with rapid sensory development. Puppies are
fully alert to their environment and will startle easily at sudden sounds and movements.
During this time they are able to recognize their breeder and other significant humans
by smell, sight and sound. However, they have lost the natural insulation of the
neonatal period and negative events can easily imprint basic behavior during this period.
Social bonding begins to occur during this week.
Neonatal behaviors such as head swinging, mewing and crawling back and forth stop.
Pups are more active and moving well on their feet. This is a time of rapid physical
change. There are also significant changes in brain waves during this period and pups
are now able to learn from experience and to retain what they have learned.
Breeders Do’s: Introduce new tactile sensations in puppies box pups enjoy borrowing in
shredded newspaper, for example, or crawling over a rolled towel or blanket. Continue
daily handling, adding new sounds and sights to the environment radio, TV, telephone,
computer and printer. Introduce toys and make sounds. Pups can be removed from the
box and placed on new surfaces. Do this with two pups at a time rather than separating
from litter.
Breeder Dont's: AVOID LOUD NOISES OR SUDDEN CHANGES DURING THIS
PERIOD. Negative events can permanently imprint on the pups during this week. Do
not run vacuum cleaner around pups, blow hair dryers, run clippers etc. Postpone
having work done on your home and ask prospective purchasers or curious friends to
wait to the end of the 4th week to visit puppies.
Do not move puppies or separate from dam during this week.
THIRD PERIOD 21-49 DAYS
Characteristics: Social awareness, learning to become dogs (note: first week of this
critical stage of develops overlaps with second period of development). Play fighting
behavior becomes increasingly intense. Pups are developing problem solving abilities,
physical coordination, bit inhibition. Mother begins weaning pups during this period,
those beginning to initiate discipline. During this time puppies will begin to move to the
far corners of their bed, box or pen to urinate and defecate.
House breaking can begin!
Breeder Do’s: During entire period leave pups together as litter and allow dam free
access to pups.
During 4th week (21-28 days) introduce food to pups without removing the dam. You
can feed her in the litter box at the same time. Begin escalating sensory experience (see
notes on critical period). Continue daily handling by breeder and family members.
During 5th week (28-35 days) Introduce pups to the outdoors. Take them outside to
urinate and defecate after drinking or eating. When this is not possible provide pups
with a designed bathroom spot to begin the housebreaking.
Begin handling pups individually away from litter mates and dam for at least 10 minutes
each day. Enlist the help of family members, friends, neighbors and prospective puppy
owner in this process. If you cannot handle 10 minutes each day, do 5 minutes. Daily
experiences away from litter mates are crucial.
During the 6th and 7th weeks (35-49 days) Increase sensory experiences with brief car
rides. Introduce pups to vacuum cleaner. Puppies can begin simple training routines
using food lures and social attraction at this time. Start teaching pups to stand on
grooming table to be examines or to be brushed.
This is the prime socialization periods. Introduce new people, especially children. Pups
enjoy interaction with a gentle adult dog kindly auntie or uncle who will baby-sit with
patience.
Introducing situations that will stimulate problem solving behavior- - tunnels, cardboard
boxes, gates. steps, fences, logs, etc. Allow pups to have successes and reinforce these
successes wit food.
Breeder Dont's: DO NOT REMOVE PUPPIES FROM LITTER DURING THIS
PERIOD!! Do not completely remove mother. Do not correct for play fighting,
housebreaking errors, or mouthing.
FORTH PERIOD 49 DAYS TO 12 WEEKS
Characteristics: Enlarging social awareness and bonding outside of litter. Mental
abilities are fully formed but pups lack experience. This is the optimum time to teach
new things and is, in fact, the period of fastest learning. Research has shown that
behaviors can be shaped and modified most easily during times when learning is
occurring most quickly. Training during this time will actually increase the capacity to
learn by increasing brain cells in the appropriate regions of the brain.
Bladder and bowel control developed and pups are capable of sleeping through the
night without accidents.
Breeder Do’s: Greatly enlarge the puppies world between 49 and 56 days. Begin puppy
rotation, playing and sleeping in smaller groups. Pups that remain with breeder cam be
created with one or two other pups. Be sure to switch puppies around.
Continue individual grooming, play and training sessions with each pup. Gentle but firm
discipline from humans may be begun. Begin teaching response to simple commands
such as sit, down, stand, come, walk on lead at this time. Pups during this period can
learn complex behavior chain and can make associations.
Breeder Dont's: Do not isolate from humans or unnecessarily restrain during this period
(only restraints should be crate or necessary fencing). Avoid inadvertently reinforcing
fearful responses.
NOTE: FIRST FEAR IMPRINT PERIOD OCCURS BETWEEN 8-10 WEEKS,
AVOID PLACING PUPS DURING THIS TIME. AVOID SHIPPING PUPS, EAR
CROPPING OR ANY TRAUMATIC EXPERIENCES.
Pups that have been properly socialized and bonded with breeder can be successfully
placed at 10-12 weeks after they have passed the fear imprint period and while they are
still young enough to be “ babies”.
FIFTH PERIOD 3-4 MONTHS
Characteristics: Dominance period where pup solidifies position. Pups will begin testing
their place in the world during this time. They tend to become emboldened. This is a
period of very fast physical growth.
Breeder/Owner Do’s: Pups must be treated as individual dogs. If they are still with the
breeder they should no longer be treated as part of a litter and should sleep alone in
individual crates at night and all training and grooming sessions should be individual.
Introduce behavioral dominance exercises, “Alphabetize” yourself and your family -
feed pup after you eat, move crate to different locations so pup doesn't’t become site
protective, take food and toys away while pup is eating or playing.
Continue socialization and obedience training providing slight distractions. TEACH
THE RECALL AND PRACTICE IT SEVERAL TIMES EVERY SINGLE DAY!!!! Do
this before pup enters the “flight period” at about age of 16 weeks.
Breeder/Owner Dont's: No tug of war games. Do not allow pup to sleep in bed with
humans. Absolutely forbid all chasing games with children.
VERY, VERY IMPORTANT NOTE: DO NOT RAISE LITTER MATES OR TWO
UNRELATED PUPPIES TOGETHER DURING THIS PERIOD!!!
SIXTH PERIOD 4-6 MONTHS
Characteristics: The flight period, corresponding to teething. Pups begin testing limits.
May attempt to assert dominance over human pack members (especially children). May
“forget” housebreaking.
This period is characterized by independence and willfulness. Owner or breeder is no
longer Mommy substitute.
Breeder/ Owner Do’s: Keep pup on lead when outside fenced enclosures. Continue
recall training and response to commands. Continue dominance exercises and handling
all parts of pups body.
Breeder/ Owner Don’ts: Do not let pup off lead if at all possible. Do not chase pup or
play chasing games.
SECOND FEAR IMPRINT PERIOD 6-14 MONTHS
Characteristics: Sexual maturity, hormonal changes. Fearfulness of new situations,
objects, people, other dogs. Male doge begin lifting legs.
Some individuals will pass through this periods faster than others, often with no
noticeable problems. Others may display marked changes in behavior in strange
situations.
Reinforce the behaviors you want: do not reinforce fearfulness by coddling to
protective behavior. But also try to avoid punishing fearfulness. Try to adopt a firm but
patient and kindly attitude to the pup’s fearful behavior. Continue socialization to
humans and other dogs. Avoid or postpone extremely stressful or traumatic experience
for the animals that appear to be in the fear imprint period.
NOTE: This primer on critical stages of development is an attempt to consolidate
information appearing in a variety of publications from a number of authors, and to
tailor that information specifically to the needs of breeders.
Remember that consistency and PRAISE are the key words here.
Thank you Carol for sharing in your knowledge and helping us to understand the
different stages in a puppies brain development.
| Different Stages of Development in Puppies This article was written by Carol Kufner. We wanted to share it with you with hopes that it will help you to understand the different stages of development in a puppy from the age of birth to 14 months. |
This site is maintained by Olive Tree Maltese - Last updated 11/19/10
