Cat not eating

Hello, My 15 year old cat has hardly eaten anything over the last week, he sniffs the food like he wants it but won’t eat much. I’ve tried all different types of food with no luck. He’s also purring a lot and following me around like he’s trying to tell me something maybe? He does have a sarcoma on his back leg which they removed part of a year ago. He hates going to the vets so would be good to know what they might check if I take him? thank you

Hello - for cats, anorexia (being 'off their food') is a symptom - and that symptom has lots of possible causes, commonly including problems with the teeth, stomach, liver, kidneys, endocrine system, bladder, heart, joints and brain.   .  Pancreatitis is a common one in older cats, and I mention it because it often needs its own special blood-test (the old-style ones don't pick up most cases).  I wonder if your cat is caught between hungry and unable to eat, hence following you around.  I am worried by your use of the word 'if' in this case because cats' metabolism changes when their bodies are hungry and they can become more sick, so it may be that there is an emergency element to this.  If you call your vets, they will 'triage' the case in order to help you to decide.