[Ellie May]

I'd say if it was just once in awhile around the ribs, that'd be different. Touching lightly should not hurt anywhere. Touching the abdomen itself firmly should not hurt like that.

I wouldn't ask for anything in particular. I'd just make the appointment for pain of unknown origin and tell the vet exactly what you typed here. They'll know what to do. Xrays may be in his future (and potentially bloodwork).