Why is my cat quiet, not eating, and whistling after a fight?

Poor baby. It sounds to me like he needs additional medical attention. His pain control may not be adequate for his injuries, or he could be developing an infection. I would recommend taking him to an emergency vet clinic tonight to be assessed and his treatment adjusted.

This is a medical emergency and Jinger needs to see a vet now. It would be very concern he was attacked or injured when he was missing causing his symptoms. It's actually extremely serious when a cat won't eat, and he has to have veterinary care now. Please take him into a vet immediately. Best of luck.

He may have not escaped uninjured. It is possible he was bitten and is developing and infection or abscess. Cat bites can be difficult to spot. Ideally, he should be physically examined by your veterinarian. He may need antibiotics and pain medications.

It’s actually quite serious when a cat won’t eat, and that tells me Nightfury is in a lot of pain. Unfortunately there are no OTC pain medications you can give him. Many are toxic to cats, and are fatal if given. You need to take him into an ER vet now.

This sign is very concerning and may eventually be in a life threatening condition. Fever or extreme discomfort may be present. I would strongly recommend an immediate check up to confirm this clinical suspicion and have the appropriate treatment performed. Antibiotics may be needed.

Fighting can result in wounds which can become infected causing the symptoms reported. Ideally, the two cats that haven't eaten should be examined by your veterinarian. Cats that do not eat for 2+ days are at risk for developing serious liver related complications. Blood and urine samples can be submitted to assess major organ function and to diagnose systemic infection. Antibiotics and pain medication can be dispensed if necessary.

This is a medical emergency and Whitey needs to see a vet immediately. It's extremely serious when a cat doesn't drink or eat for 18 days, and it indicates he is seriously ill. He needs veterinary attention now, please take him into a vet right away.