How Do I Know if My Puppy Is Now a Full-Fledged Dog? How old is your puppy becoming? Perhaps it’s impossible to tell. In the beginning, you’ll remember how his teeth started to come in, how he learned how to play fetch, how he was toilet trained, and how socialized he was. However, as your dog ages, his developmental changes become smaller and more subtle. In order to keep up with your puppy’s changing demands as he matures into an adult dog, you need to be aware of the changes that take place at each stage of his growth. …
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