Florabug!
I just got a big rock in the pit of my stomach reading your post. Please take that little guy in to the vet for a complete workup. Even a 5 year old dog wouldn't be that lethargic. He should be getting into mischief and running all over the place.
It could be something very simple and easy to fix but something is definely wrong. Good luck and please let us know what the vet says.
Hugs
L |