I have a developmentally disabled cat, I found her as a kitten under a house, alone, no cats in area so idk where she came from. No telling if the mother abandoned her because she was different, or if she got brain damage from being malnourished after being alone. She was on the verge of death when I found her and had tremors from being so hungry. I had no cat food so I fed her my own food, raw, no seasonings (bad for cats) until she was a healthy weight. Then I took her to the vet and that was 3 years ago. She never went back to normal, and is the only cat I've ever seen slip or bump into something, but I love her. (She can still hunt, and I find lots of mice heads outside).