Does a pet sitter cost more if you have two cats? I don’t think so. That’s why I’ll get one if I go away, plus the mail will be looked after too. Catteries would be double the cost of course. About the cost of food: I find with two cats I can buy bigger/better value packs, at the end it works out about the same as for one cat. The double cost is the vet, yes, but then again you can have a cheap healthy cat or an expensive one, so it’s a risk anyway.—M.C.