Hello I am Dr. Joey. Thanks for trusting me to help you and your pet today. I am a licensed veterinarian with over 15 years of experience. I look forward to working with you.
This sounds quite concerning for Max. You sound to be doing a great job taking care of him; trying to get food into him. Good thought to be teeth, and this is certainly possible. The type of dental lesions cats get (resorptive lesions) are very painful and often not visible (beneath the gums) but this is very rare to cause a cat to stop eating and would not lead to vomiting. Unfortunately his symptoms are vague and could reflect one of a long list of potential issues ranging from organ issue (liver failure, kidney
failure) to pancreatitis to endocrine disease (hyperthyroidism
mellitus) to inflammatory bowel disease to intestinal parasites to infection (bacterial, fungal) to cancer.
I really wish I could narrow down this list and give you and exact diagnosis, but I would need to perform an exam followed by some testing (as your veterinarian will need) to narrow down this list. This testing would include a CBC, chemistry profile, thyroid screen and urine check +/- fecal analysis and X-rays. With that information we probably could identify the cause.
So, the best for Max is to schedule an appointment tomorrow for him to be seen. In the meantime, continue to tempt him to eat with his favorite foods. You are welcome to try an anti nausea medication such as Pepcid AC (famotidine) at a dose of 5mg (half of the 10mg tab) every 24 hours. This might help the vomit and improve his appetite. There are no side effects to anticipate other than concern he may not keep it down long enough for it to work, since he is vomiting.
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