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Has her fur changed with the smell? Like she is more greasy?
When she is on antibiotics for her mouth is the smell less?Dr.V
Well there are a few things I think about. First, the most overlooked cause of a "stinky" cat is pododermatitis. Infections between the toes...and people rarely look between their toes... It would get mildly better with antibiotics...but not cured.
Second, as Nancy has stated, using a better food choice. Every cat is different...but I agree that some of the lesser foods may cause problems. I tend not to think odor as much as gastric issues...but anything is possible.
Last...cats that have pancreatic or intestinal absorption problems have a hard time breaking down foods and absorbing correctly, therefore there is more "byproduct" whcih can result in an unhealthy hair coat and smell. These problems do not ALWAYS result in fecal changes..so I would ask your vet about the possibilities.
Hope this helps!!