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Find out more about your dogs
"Adolescence" in puppies can start from about 10 weeks of age and lasts for several months. This can include:
Rise in level of aggression: consider the causes (more territorial, trying to assert dominance over owner)
Adult coat replaces puppy coat
Maturing sexually so the interaction between male and female dogs changes.
Like rebellious teens, adolescent dogs can be a handful – hyperactive, inattentive and hormonal. But that’s what you get when nature provides an immature brain with a body that’s nearly the size of an adult.
A fast growing dog needs guidance and patience during this difficult life stage.
Possibly become shy or frightened of things he or she took in stride just a few weeks before. Don't force your dog to confront something that frightens him or her, but don't coddle (and thereby reward) his or her fears, either.
The Merck Veterinary Manual
Veterinary Partner: The Canine Behaviour Series
By: Kathy Diamond Davis, Trainer