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Hi there, were you able to see my above message?
Without further information it is very difficult for me to provide the best advice but I will certainly try.
Please reply when you can and we can continue the conversation.
Felix's signs are a red flag for me.
Unexpected weight loss and a change in appetite could be due to e.g.
The vet will examine him and may run some tests such as a blood and urine test.
His treatment will depend on the results, but several conditions can be well managed and even cured with medication. So a vet visit is very important.
I do hope this helps and please let me know if there is anything else,