Do puppies go through adolescence?
My GSD is now a 7 months old. She behaved beautifully up until about a month ago. At about 6 months, she started to pull on the leash, even though she had already been trained and was walking very well for months. The hardest part is seeing another dog. She goes ballistic! She wants to play and starts lunging, pulling, yelping etc. It is difficult to handle her because she is so big. Why did her behavior change so? And what can I do about it?