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Hello, JACustomer. I have been a Veterinary Nurse for over 15 years and would be happy to help you today. I'm reviewing your question right now.
1) When did Jason last have blood work performed? 2) Is he still eating and drinking well?3) Are you taking any preventive measures for hairballs? 4) Is he on any meds at this time?
Was blood work performed at that time?When he vomits are you seeing undigested food? hair? fluid mostly?
Because of his age, it would be wise to rule out underlying conditions like kidney disease, hyperthyroidism, diabetes, etc. These all can cause cats to vomit.More info here:
Kidney disease: http://www.vet.cornell.edu/fhc/Health_Information/kidneydisease.cfm
Hyperthyroidism: http://www.vet.cornell.edu/fhc/Health_Information/brochure_hyperthyroid.cfmIt wouldn't hurt to add in some pure canned pumpkin to Jason's food, too, to help move fur through and see if this might be causing the irritation in the GI tract. You can also try laxatone from a petstore which will help to move fur through. Even if this turns out not to be the issue, it won't hurt to use with the treats you're giving and should not cause him any problems medically.