I'm thinking that they will be just fine!! It is you that I'm worried about!! LOL!!! I'm the same way, myself, but much more comfortable leaving the cats than I am the dogs. The cats sleep, eat and hunt.....and they come in and out like clockwork. My petsitter comes twice a day, but only because of the dogs and now the birds.

Have a great trip and imagine the joy you will have walking back in the door!!!