During the age of 3-6 months, puppies go through some major physical and behavioral changes such as increasing in size, teething, and becoming afraid of new places and people. Be prepared to care for your puppy during this important stage of development.
physical development
At around 12 weeks of age, puppies begin to have better control over their bladder and bowels. Teething should slow down around 16 weeks or four months of age. By six months of age, all adult teeth will be in place.
change in behavior
Your 12-week-old puppy is nearing the end of an important socialization window.1 Make the most of this time period by introducing your dog to new people, places, and things. Until your dog is fully vaccinated, he should not be on the ground, around unknown animals or in highly populated dog areas.
He may also have some destructive chewing problems at this stage (due to a combination of teething, general teenage misbehavior, and possibly boredom). Make sure your puppy gets plenty of exercise and works on training regularly. Be consistent and firm.
health and care
Your puppy will need to visit the veterinarian regularly between 8 and 16 weeks of age for vaccinations and routine checkups. During this time period, it is important to keep your puppy away from unknown animals and public places where other animals may have been.
food and Nutrition
Proper food and nutrition is a huge part of your puppy’s development. Make sure you are feeding the puppy food (dog food labeled for growth) and in appropriate amounts.