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Hi, i`m Richard, a Veterinarian from the UK. Hopefully I can help today.
Did he have blood work to diagnose his thyroid condition? The pattern doesn`t quite fit together. Cats usually have trouble with an overactive thyroid which usually results in a ravenous appetite. If he has a reduced appetite, then I suspect some other problem may be ongoing here.
Losing weight is yes, but they often have a ravenous appetite with it. How long ago did he have the blood work?
I`m afraid I am unable to offer a live phone call from the UK, but I am happy to continue here. if you would prefer, I can opt out and one of the other vets may be able to offer this service?
There are various things you can do to stimulate a cats appetite. Their appetite depends highly on their sense of smell, so offering smellier foods such as fish can help stimulate appetite. Also, heating the food in a microwave, just for a few seconds, not to warm the food up, but just to bring out the aromas from the food. There is some medication such as mirtazipine that can act as an appetite stimulant and can be very effective.
If he is showing signs of nausea, then medication such as zantac can be effective at reducing the signs of nausea leading to an improvement in appetite.
However if your cat has weight loss aswell as reduced appetite, it may be wise to consider further investigations, as the initial suspicion of herperthyroidism may not be his primary current problem.