My cat lost a testicle in a fight; something like 10+ cm of intestine is protruding from the scrotum, but it still eats and poops.
Expert Answer
If a cat loses a testicle in a fight, see a vet promptly to treat the wound and avoid infection and inflammation. The thing protruding from the scrotum that looks like intestine is likely the spermatic cord, which carries sperm, blood, and nerves. For now, restrict the cat’s activity to prevent the wound from rupturing or getting infected.
If the cat licks the wound, put an Elizabethan collar on it. Finally, if a vet visit isn’t convenient, rinse the wound with saline and disinfect daily with iodine, keeping it dry and clean.
That protruding cord after a fight is not something to wait on, I'd get him to a vet today. The "intestine" is likely the spermatic cord, and if it's hanging out it can drag in infection or get damaged. Keep him calm, stop any licking with a collar, and don't try to push it back yourself. He's eating now, which is good, but that wound needs proper cleaning and probably sutures before it turns septic.