I have a male golden retriever that is about a year and a half old. He is normally very energetic and always wants to play. I had to go to work as usual and when I returned home, he was acting funny. He didn't jump up to greet me, doesn't run nor does he want to play. He mainly just wants to lay down and sleep. When I call him, he comes to me with his head down and tail not wagging very much if there is any wag at all. He doesn't want to eat his dog food or treats. Normally he is a garbage disposal and will eat anything. He doesn't seem to be in pain because he walks normally but something isn't right. Anybody have any ideas?

You really need to take your dog into the vet for this one. It could be anything from back pain to abdominal pain.

Dogs who go from being a "garbage disposal" to having no interest in it whatsoever is very alarming.. You need to take your pup to the vet pronto!