My 9-year old non-diabetic cat seems unable to eat. He eats a little then runs and makes a gagging sound. I had him to the vet a few weeks ago for inflamed gums and he was on clindamycin for 2 weeks. She wants to do a dental, but I know they can be dangerous. Any ideas what could cause this. It's almost as if he can't swallow. i'm taking him back this afternoon to see a different vet. Thanks.