Hi,
It sounds very much like one of his anal (scent) glands became infected and formed an abscess, which has now burst. It is not an emergency unless he is bleeding profusely, but he will definitely need veterinary attention tomorrow.
If he will tolerate you doing it, I would gently bathe the area so there is no gunge stuck in his fur, and try to stop him licking at it too much.
Also, if you are unsure, you can usually call your emergency vet and ask for advice over the phone without charge.
Eleanor Wood
UK vet
Hello Amy
There are a few good options for you.
First be sure that the problem is hair all related. You may need your vet to help you understand hoe to correctly and accurately identify vomiting in cats ( for example we need to identify vomiting versus regurgitation and be sure that it is a foreign body (hair) versus other problems…. The list is long and wide). If it is determined to be hairballs then I would recommend brushing daily to reduce the amount of hair your cat ingests, or even shaving the coat once or twice a year. Any reduction in the amount of hair ingested will help. I have many clients who shave their cat down. I have to admit that both the cat and the owner are happy afterward.
You can also try a hair ball food. I like science diet. I put my cats on it and I think it worked very well.
There are also oral hair ball medications. These are available over the counter. They help lubricate the hair so that it passes.
I hope that this helps.
The most important thing to do is to be sure that your cat doesn’t have a gastrointestinal problem causing excessive grooming, or a skin problem causing an excessive shedding problem. All of these should be discussed with your vet.
Best of luck.
Thanks for visiting. And for posting a picture. She’s a cutie.
Sincerely
Krista