How old is the dog, what breed, and what are the other symptoms besides the bloating and decreased appetite? Any vomiting/diarrhea/trouble breathing? I would suggest gettting the dog to a vet right away; time could be of the essence if he is experiencing GDV (bloat)!
Bloat can be life threatening. This might be a twisted stomach,some breeds are more prone this. Was your Dad feeding him and ,if so what?
Only first aid I know about, if it is gas,is a stomach tube but even I would hesitate trying that.
Agree, would try to get the pup to the Vet ASAP!!!!
When puppies do not eat or drink it should always be treated as life threatening.