There is no disputing the fact that having rich and varied social experiences in the first three months of life improves a puppy’s odds of a growing into balanced, confident dog. Also not in question is the reality that canine under-socialization can result in behavior problems, fear and aggression, all primary reasons for relinquishment and euthanasia in pet dogs.
The window in which the most effective socialization takes place is only open between weeks 3 and 12 of the puppy’s life; then, it slams shut. Given that the last combination vaccine (against distemper, hepatitis, parvovirus, parainfluenza and coronavirus) is usually administered when a puppy is 16 weeks old, it’s also the genesis of a dilemma.
Some veterinarians, shelters and breeders advise new owners to wait until after a puppy has had her final set of vaccinations to allow her to interact with others. Unfortunately, by that time, the socialization period has ended, precluding the pup’s best shot at acquiring lifelong dog-on-dog social skills.
So, I was particularly interested in a study conducted by the UC Davis School of Veterinary Medicine, which looked at the risks to partially vaccinated puppies of contracting parvo at indoor puppy socialization sessions (socials). The results were reassuring.
Risk vs. Reward
It seems that puppies who have had only their first set of shots are at no greater risk of being infected with parvovirus than those not attending socials. During the study, it was reported that none of the 15 puppies who contracted parvovirus had attended puppy socials, and that none of the puppies who attended socials contracted parvovirus.
This dovetails perfectly with the standard of care recommended by the American Veterinary Society of Animal Behavior (AVSAB), which unequivocally encourages owners to begin socialization classes for puppies as early as seven to eight weeks of age, and seven days after the first set of vaccines. The American Veterinary Medical Association, the ASCPA, and other dog health and behavior experts concur.
As the ASVAB statement reads, “The primary and most important time for puppy socialization is the first three months of life. During this time puppies should be exposed to as many new people, animals, stimuli and environments as can be achieved safely and without causing over-stimulation manifested as excessive fear, withdrawal or avoidance behavior.”
It is important to note that structured puppy socials run by a variety of training and daycare facilities and other pet-related businesses take place indoors on non-porous surfaces, and “accidents” are cleaned up immediately with an antimicrobial solution. Porous surfaces, such as dirt, sand and, in particular, those found at dog parks, must be avoided until full vaccination.
Also, puppy socials do not guarantee that a dog won’t develop fear or aggression later in life; genetics, in-utero experiences, early nutrition and the first weeks with the mother and siblings also play key roles.
Why is the window of opportunity so small? At the risk of stating the obvious, puppies develop much faster than their human counterparts. For example, puppies walk beautifully at three weeks, but it takes babies about a year to reach that milestone. This acceleration affects canine cognitive function, which develops rapidly during the short socialization period; it’s during this time that a puppy’s framework for future social functioning evolves. A strong foundation built from a rich set of early experiences gives the puppy more context in which to evaluate and react to future stimuli in the environment, including people and other dogs.
As mentioned, the true socialization period of puppies—the time during which they readily incorporate new experiences into the developing worldviews that directly affect lifelong behavior—lasts from weeks 3 to 12. That’s it. Since most puppies remain with their mother and littermates for seven weeks (a whole other topic), this means that new owners have just four weeks to make sure their puppy has ample opportunities to learn that there are many sorts of people and types of dogs in this world.