Ive had my rescue cat for 6 months he's about 2 1/2 years old. I've had him at the vet twice in the last few months due to vomiting which seems to be being caused by hairballs. He's always had a very good appetite but last couple of days is hardly touching his food. He will eat a bit of cooked meat if I hand feed it to him though. Should I be very concerned? Does it mean another trip to the vet? Vet has seemed pretty unconcerned on the previous visits.