
if you're really worried, get him checked out by the vet :)
both my dogs do this and like humans, some are more gassy than others ;) My boy burbs like a man, but then he is a complete slob in all other areas as well :P he loves his food, is always sniffing about the floor for more, so takes in a lot of air, I guess it has to come out somewhere, although, thankgod, his rear end wind is very rare :)
Diet could have something to do with it, I find that some foods make my dogs more gassy than others.