Cat eating dog food

My three year old cat has gone off his purina
Pro plan complete essentials. Recently he got into the bulk, super cheap dog food I buy to feed the raccoons (a mom and her weaning kits who live in my backyard tree) obviously, this is not really a solution and obviously need to switch it up. Does anyone have any recommendations? I tried science diet, which one of my other cats, a senior missing a few teeth, seems to prefer because of the smaller kibble size. But the three year old is uninterested. He does eat his nightly wet food at least.