I have been feeding a stray cat or 2 for over year. One of them has just now started defecating near the food dish almost every night. About a foot away from the dish. They never did this before. The only changes I have made is a started putting 4 each of Meow Mix treats and teeth cleaning treat in with their food. I don't over it with the treats or anything. And it's good food I give them, dry Purina Gentle. I put about 2 cup of food out there and put the treats in the corner of the dish. Something also new is a got one of those heated mats (non-electric) for the box I have out there for them to sleep in. I hardly ever see them, not even sure if they (or one of them) sleeps in the box. I think they might sleep out there for a little while, kind of looks like they do. Anyway, I hate to just stop putting food out there due to this pooping issue. What should I do? It is an upstairs protected porch.