Mine eat a lot of guppies and sometimes bugs and cooked salmon or catfish.
I'm usually on here just long enough to farm, fish, cook the things, and do the activities but usually log off when my wolves are all becoming hungry. So I wind up with a huge stockpile of foods. There's a user on here I've talked to who grinds a tonnnnn for WW so I've recently decided to unload most of my extras onto them bc they're nice and I'm too lazy to list things on flea market.