Cat throwing up?

Ask: I have 3 cats and one of them is throwing up constantly. I don't know which one is doing the barfing, and we found 3 large vomit piles of food sitting on the carpet by the front door and in the bathroom. So far, I have seen 4 barf piles total, and not knowing which kitty it is. Any tips on knowing which cat is vomiting and why they're doing it? (P.S. We feed them 1/4 cup two times a day at 5:00 am and 4:00 pm


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