Last night I hatched my first feathered tabby from the kiosk. Checking the pet tome this afternoon for likes I found the snack space empty which I've never seen before. Normally on pets that the tome can't figure out it just shows the cracker with mouse over message "this pet likes snacks" (which I think is another bug but not the focus here).
So I started training to figure out what snacks the critter likes. It doesn't like any of the normal snack classes of fruits, vegetables, meals, munchies, candies, or deserts. If I try one of those that isn't a balance snack it merely eats them. The only loved snack I could find was Honey Tombs Cereal, with also a like from all the other school cereal snacks. It would appear that the liked snack group is cereals which would make this pet unique and I guess maybe the art department hasn't made an icon for that group in pet tome. Or maybe it's not intended and a bug, you tell me.