My 12 yr old corgi is not eating as he used too. He still eats all of his food, but he eats maybe 4-6 hours after we give him the food. Whereas before he would eat right away. He doesn't act much different otherwise. Still has a decent energy level, nothing else seems unusual that I would need to worry. But is this something I should see the vet about? I'm asking here first because I don't really have the money to spend on the vet.