Vomiting

For the last couple of months, Griffin has been vomiting frequently. Not throwing up his food necessarily, but usually just a little bit of liquid. It has increased in frequency from maybe once a week, to now every couple of days, to sometimes a couple times a day. He does have episodes seemingly every day where he wretches a little bit, but nothing comes up.

At first I thought maybe it was because I had switched the boys' food, because it started around the same time. (Switched from TOTW to Blue Buffalo, basically because the store nearest to me doesn't carry TOTW.) For a couple days, Bastian started throwing up too, except he was throwing up his food, not just the liquid that Griffin does. So then I switched the food back to TOTW. Since then, Bastian has not vomited, but Griffin still is.

They are both eating and behaving normally. I have seen one loose stool in the litter box in all this time, but I don't know which kitty it was from. Both kitties are 3 1/2 years old.

I am planning on calling the vet on Monday, but I'm curious to get some thoughts from the community on what might be causing Griffin's problem. Could it be a hairball that he can't bring up? Some kind of partial obstruction?

Try feeding some canned... maybe that will stay down

It could very well be the change in food. Something in it may not agree with his system. He could also have a hairball problem. How old is he?

He is 3, almost 4. The boys do get canned food usually several times per week, but Griffin isn't vomiting his food. All that comes up is liquid when he throws up.

I really wonder if he doesn't have a hairball that he is having trouble bringing up. He has never had hairball issues before, but with the amount of hair on this cat it would not surprise me if it was an issue for him. He is about half grown-out from his last lion cut, but he is still a very furry boy.