They understand

If I say "Harry, yoghurt!" He will come from anywhere in the house to lick what is left in the carton.

Filipos has beautiful manners former a street cat. If I'm eating something he likes, once I've offered him a morsel, he will sit down quietly. Thomas Leo never asks for anything at all. Harry will extend a very long paw and try to help himself. Reuben won't take "no" for an answer.