I've always been told the same, ie to give them something light and bland after an op, but I have always given them a normal meal as they tend to demand normal service. Only exception being when Mosi had his op last year to remove string - he wasn't up to more than a few nibbles of chicken when he got home. I would let Zorro decide when he's ready to eat normally. Just don't give him anything too rich and go easy on the portion size - several small portions better than giving him lots at once.