Food allergy & pooping outside of litter box
This is going to be a long story, but idk what info is most important in you all giving me the best possible advice.
I have two females that are about 7 months old, they have had their shots & been dewormed & all that jazz. As best as we & the vet can figure, the one has a grain intolerance that causes her significant digestive upsets. They were on Iams kitten kibble when the one, Zeppelin, started getting "poopcakes." Basically diarrhea the consistency of pancake batter, and then they turned bloody. Made the switch to Nature's Instinct (grain free, chicken based), & she had the best poops I've seen pretty much since getting her. They've been on the food for a little over a month now, & the consistency of her poops have been degrading steadily back to between a brownie/pancake batter.
So the litter box problem. She poops in them *most* of the time, but has started pooping in corners near the litter boxes. Not peeing. The best I can figure is that she has maybe developed a litter box aversion??? If pooping hurts, & you poop in a litter box, then the litter box is what makes you hurt type of a thing. How do I fix this?
We have two cats & two litter boxes, they get cleaned daily. Maybe add another litter box?
The vet suggested that different protein bases can give cat's different reactions, & so maybe I should try the turkey or rabbit or another brand entirely? I asked about tests to confirm whether or not it is a grain allergy & she said there was a skin test? but it is unreliable & she didn't recommend it. Zeppelin is a longhair, & while she collects a lot of dust, she doesn't have flaky skin.
Ugggg, I'm open to any suggestions.