Can You Tell Me What Is The Best Diet For Hairless Cats? I Have A Rescue Cat That Seems To Be Having Dietary Problems-namely Always Hungry, Breath Smells Almost Like Bowel Movements, What Can I Do?

Does hairless cat need special diet? He seems to throw up his food alot, breath smells like feces,cant seem to fatten him up, he's slightly underweight but doesn't gain no matter how much i feed him. Drinks lots of water