Around 2 months ago we got two new rescue cats - brothers. The rescue said they fed them a variety of foods - just whatever they had donated and if we offered variety it wouldn't upset their stomachs.
We have continued to do this and one of them is fine however the other has started having loose stools pretty much daily for the last few weeks.
It was definitely worse when he accidentally ate some cheese. But I've tried to make sure he isn't getting human food now and it's still happening.
Would people advise I switch to just one brand of cat food and monitor or should I take him to the vets? He seems fine otherwise. No sign of illness.