IT would have been nice if you guys were leaving in August,we have the same problem and the same vacantion date.I would love to help you but I do not know how.We were thinking to have our cat in the house and have some friends come over to feed her so that she will not be stressed with moving to another house.Cats are very attached to the houses they live in.Maybe you can do the same,or ...keep me posted and maybe they can stay together for the vacantion.I am afraid they will fight:)mine is a "she" and the same age os yours.Relpy to me ...