One of my two 8-months old in-door kittens(sisters, both adopted at around 4 months) has been pooping all over my living room for the past 3 days. For the past 3 nights, she's been running around my apartment, freaked out after she starts to go to the litter box, then all of a sudden she'll act crazy by dashing out with poop hanging on her rear end. She is a long hair tabby mix and it seems that she's forgotten how to use her litter box. Her sister is still using the litter box as usual, but she (Milukhu) has been pooping on the carpet and tonight I've finally looked closely at her poop and there are lots of hair (her own hair) in it. I am desperate and don't know what to do to change this terrible ordeal, since I have to scrub the carpet, windows, counters, etc... every night after she goes (she runs all over after she poops on the carpet). Can anyone please tell me how to change her diet so that she won't do this anymore? I've given her "hair ball" treats and grass every so often to let the ingested hair pass through. Do you think I shouldn't give her so much? I would think they need to let the hair pass through every so often. I've also been brushing her almost every day. Currently, I feed her Purina kitten chow (dry food) and can food. Please let me know if anyone can give me any advise or solution - I am really desperate in resolving this situation. Thank you so much