Thank you Elizabeth,
Your answer seems to have made it past that odd computer glitch (the mixed blessing of technology).
Now the reason for question about is a breath odor is because this can sometimes give us a hint of what is causing issue. For example, sweet pear drop or nail polish remover types scents have been linked with unstable diabetes. Pus or infection type odors often suggest dental disease, tooth decay, or oral trauma or ulceration. Ammonia scented breath (which does smell quite rotten or sharp like a dirty litter box) can be a sign of the issue I am most concerned may be afoot here especially if he drinking more then he used to and if urine wasn’t checked -- kidney troubles.
And while I do understand that he did have a blood sample was normal 2 months ago, we have to appreciate that any blood sample can only reflect the state of the organs at that point in time. Therefore, we do have to appreciate that if he had had borderline or early stage kidney disease then it could have progressed since that time. Furthermore, and the reason why I asked about urine samples, is that that it takes 75% of kidney dysfunction to occur before we appreciate changes in the blood. So, it is possible for bloods to still appear normal in the early stages of kidney troubles. And I must say this is my concern with your lad.
Now in any case, to have a cat off his food with an odd odor to his breath, we can assume that the root of his troubles is either oral discomfort or nausea (even without vomiting). Now we will put oral discomfort to the side for the moment (since you noted he had lovely teeth before, and didn't note any pawing or drooling) and focus on nausea.
Now we can see nausea arise with a range of issues, but with out concerns, I do have to note that we can see anorexia due to GI upset associated with kidney disease. And this is very common in kidney kitties. This is because the the urea can make them nauseous and cause oral ulcers, making them too sick and sore to eat properly.
Still no matter the cause of nausea, I would note that we try to settle his stomach with an antacid. There are a number of antacids that can be used to help kitties in this situation (ie Pepcid (More Info/Dose) or Zantac (More Info/Dose)) and can just make eating and drinking easier for them.
Furthermore, if he just refuses to eat, then we do need to tempt him (as I am sure you have). Just to note some common light diet options we use for anorexic cats, we often will offer boiled chicken, white fish, scrambled egg, and even meat baby food (as long as its free of garlic/onion powder). If we are really struggling to get them to have solid food (or think we may need to syringe feed) then we can also use a liquid supplement called Clinicare (LINK) that can be useful for getting nutrition and fluid into these kitties (and if he likes it, then it would be a sneaky way to get more nutrition and fluid into him now). It is actually by the same people who make Ensure, but is formulated to meet out pet's dietary needs. Your vet should be able to order it for you but it is available without a prescription (some pet stores and even Amazon stock it). They make one specifically for older cats with kidney troubles, and this would be one that we could use if necessary for Enoch (I tend to use it with any anorexic elderly cat).
So, these would be the main focus of supportive care for Enoch and what I would suggest tonight. If you find that he is still down come Tuesday, I would advise that it'd be ideal to follow up with his vet, perhaps bringing in a urine sample (which can be collected by leaving him in overnight with an empty litterbox in a non-carpeted room). They will be able to check the urine sample and tell you if he is concentrating urine as he should or if his kidneys are suspect after all.
As well, at the same time , they can recheck his mouth. And if your vet has suspects that Enoch may have oral ulcerations secondary to kidney disease or a sudden dental issue, then they will be able to provide cat safe pain relief (ie Bupenorphine) to make his mouth comfortable enough to eat for you.
Finally, if you try the above and he is still resistant to eating for you, then do consider speaking to his vet about having them dispense an appetite stimulant drug (ie Cyproheptadine, Mirtazapine/ Mertazipine, etc) to encourage him to start eating for you again properly.
Overall, appetite issues with rotten breath and increased thirst are very suspicious of early stage kidney disease of the cat. Therefore, this is something that needs to be looked into for Enoch. Otherwise, for tonight, do try him with an antacid to settle his stomach and try to tempt him with those bland diet options to get him eating for us again.
I hope this information is helpful.
If you need any additional information, do not hesitate to ask!
All the best,
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