Oh - I stopped the Pine Sol also. I used to wash my floor with that and clean up potty problems with bleach. It really only bothered 2 of my dogs but it made them break out on their stomach and under their legs.
Well it certainly wouldn't hurt to talk to the vet.
I do feel your pain with the picky eaters. I find I have to rotate the Merricks wet everyday but am able to keep the same dry. I just started adding a teaspoon of cottage cheese.