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Hi, I'm Dr. Heindel. I'm going to try to assist you with your issue.
How long has the vomiting been going on? And did you recently change his food?
Is he drinking any water?
It's not uncommon for vomit to look and appear like fecal matter/diarrhea. Really, once food is digesting - it's "ingesta" and just a step away from becoming feces.
Is he keeping ANY food down? Is he urinating and defecating?
He has been vomiting for a couple of months. Lots of hair in it as well. We have 4 cats and he kicks his sisters fur. So I originally thought that was the problem. Changing the food has not made any difference.
But I have never smelled anything like this. My other cats have spit up and it isn't the same
Eating a little bit and he his using the litter box.
Okay, the first, simplest step is to start him on a hairball remedy. Cat Lax, Laxatone, doesn't matter. It's essentially flavored vaseline. I'd give him a nickle size portion every day. It's possible that he's got a dynamic obstruction of hair. The hairball remedy can help.
Do the laxatone EVERY DAY for a week, then see if that doesn't help. If he won't eat it, you will need to smear it on the roof of his mouth.
I need to stress that normal, healthy cats vomit. So do sick cats. If your cat is acting sick in any other way, it's best to get a senior wellness exam - blood work, physical exam, etc.
So that sounds good but I am still concerned about the smell. I actually thought his colon has ruptured and is leaking into his stomach! And that is why it smells!
Don't switch foods. Put him back on the food he seemed to do best on.
The smell would just suggest it's coming up from the duodenum - the proximal part of the small intestine. That's not TOO unusual.
Esp. if the hairball is in the small intestine!
Ok I will try it. Thanks for your help!
If his colon had ruptured, it would leak into his abdomen. It would NOT come out his mouth with vomiting.
Reverse peristalsis occurs with enemas - we see that when we give a cat an enema. It doesn't apply here, but I know what you are talking about.
If you don't have Laxatone (tuna is best!) - use vaseline until you can get it. I'd start right away. Continue to monitor appetite, BM and urination.
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Good luck with Gus!