usally its visable, it you feel around, you'll probaly feel a big bump
A cat will eat grass to cure its stomach ache. This may also be a hairball problem.
yes, they do have stomach aches
if it sounds like its sortof burping its probly going to be sick, if its grumbling then rub it and give it something to eat and drink
Well first you should bring your small dog to the vet if the stomach ache seems to turn your small dog visibly sad. Or if you have already took your pet to the vet and they recommended some...