Good morning Angela, it is not uncommon for adult dogs to sleep a lot...and older puppies sometimes grow into that pattern too. I wouldn't be too concerned so long as he does show signs of energy and playfulness at times during every day.
I think that the heat can, indeed, make a difference in their energy level. Unless there are other things about his behavior that troubles you, I don't think that a vet visit is immediately necessary, but I would certainly discuss it with the vet if you get a chance. (I often call my vet's office with questions and the vet calls me back with answers.)
I think that the heat can, indeed, make a difference in their energy level. Unless there are other things about his behavior that troubles you, I don't think that a vet visit is immediately necessary, but I would certainly discuss it with the vet if you get a chance. (I often call my vet's office with questions and the vet calls me back with answers.)
