Hi there, you are through to Dr Linda. I'm sorry to hear Gizmo has been unwell but it sounds as if he is being very well looked after.
At 11 months of age a cancer would be unlikely, though not impossible. Certainly, something like an IBS or food allergy would be a lot more likely.
Unfortunately, vomiting in a cat is a very non-specific symptoms, meaning it can be triggered by all sorts of things. Because of this, we often have to run several tests before being able to determine the issue.
In a young cat, I would always do several things as a primary course of action:
1) Ensure they are up to date with a good quality wormer e.g. panacur or drontal
2) Trial them on a strictly hypoallergenic diet e.g. Hill's Z/D or Royal Canin Anallergenic for 8 weeks with nothing else. Many supermarket foods will claim to be hypoallergenic but are actually not and there are only a handful of diets available that can be used in diet trials. During a trial, the cat cannot have access to anything else at all e.g. treats, chews, human foods. If they go outside, get a collar that says DO NOT FEED ME. If they manage to eat something on say the fourth week, you then have to start the trial again from day 1 for 8 weeks. The theory is that if they do have a food sensitivity or allergy, this trial will ensure they are not exposed to whatever it is that is causing the reaction and they should then have no symptoms. If it works, many will continue this diet for life.
3) A course of ant-acids and anti-nausea medicine can help to manage symptoms in the short term and make a cat more comfortable
4) Ensure there is no exposure to anything irritant or toxic in the home or wherever the cat goes e.g. house plants, chemical cleaners, detergents etc.
With regards ***** ***** work, it may be worth ordering some more specific tests (if not already done) such as FIV/FELV viral tests and B12/cobalamin/tli gut absorption tests. If not already done, I would also request a urinalysis, to rule out e.g. a grumbling urinary infection.
With regards ***** ***** it is important to know who did this. A G.P vet can typically do a basic ultrasound, but a specialist would be able to do a more specific scan that may pick up more subtle lesions and be more helpful. If not already done by a specialist, I would request this.
In some case, an endoscope (small camera) of the stomach and gut can help to diagnose issues such as ulcers and can be useful. Similarly, this endoscope can be used to take biopsies in a minimally invasive way. Not every clinic will have access to an endoscope, so consider asking being referred to a clinic that does.
We definitely need to get to the bottom of this as it is not normal for a cat to have chronic vomiting, so until we have our diagnosis, more tests will need to be run. In the mean time, tempting him with highly digestible foods and supporting him with medicine is essential.
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