Honeybun, my FIV+ boy, was getting super itchy all of a sudden, and after I sat back and thought about what was different, and when he was doing it, I think I narrowed it down to one of the pouched foo products. That WHISKAS PURRFECTLY FISH stuff. He loves it, and chows down on it, but then the rest of that day and night, he is constantly jumpy and biting at his fur and twitchy all over.

I stopped the Purrfectly Fish (much to the rest of the gangs displeasure), and he seems much better. No twitchies or itchies since.