My pet pug dog has a large belly not fat lage ,but it looks inflated he also gags very loudlyhes 9 years old he is not nudered eats and drinks easly we think it's a kiddney failure but he isn't able to take a b.m. what should I do and what's his sickness

He could have a tumor. We just had to have a huge one removed from our Aster. She is fine now. Take him to the vet.

Please follow labman's advice. It could be anything. But, the fact is, the dog is not able to pass a stool and his belly is swollen. You might be right, maybe he does have kidney failure. But, instead of guessing you need to get him to the vet immediately. At 9 years old he is not considered old for a pug. Please get him the help he deserves so he has the chance to live out the many years he has left in him.