Alright ^^ I'm not really the best at anatomy, and I'm sorry if I make a mistake on this But I'll try my hardest
Like I said, I really enjoy the face. Its well-proportioned and very well drawn. In dogs in general, the neck is just a little too long on this, but it may just be his breed ^^. As for the body, it's too much like a cat. Dogs don't really have the arch in their back. It's usually slightly arched or close to straight. The shoulders also don't come that much forward. It's much less curved. Another picky thing is the back hind leg shouldn't show that much, in comparison to the rest of the body. It looks good, but it's anatomically incorrect.
I hope this helped You draw very well already, and I think it would help to just find a picture of the dog and use it as a reference.