i hope max gets well soon! i know its uncomfortable for humans to get diarrhea so it must be the same for dogs as well.
I have stomach problems from eating something that doesn't agree with my stomach. Wonder if something is not agreeing with max.
like others have said, i think i would cut down on treats & human food until his stomach settles
perhaps ask the vet to see if he possibily have food allergies.
The sad thing to dogs having food allergies is that they can't eat treats. Mickey has allergies/sensitive stomach and any treats we'd give him as a pup he'd get sick. now he doesn't eat treats even if you give him a small piece.