Aha!! Fancy Feast. Didn't someone recently post that they noticed the company had been sold and the formula seems to have been changed ???? That may be part of the issue here. Try a different brand of canned food and see what happens.
Nutro (slightly pricey) has some moist food in a re-sealable pouch. Might be good atleast as a trial to see if the FF is the issue here.
Love me, love my dogs