I would interview as well for a spot for July that could be either a 'summer only' space or move to a permanent full time spot for the Fall if they do not return....if you find someone who only wants summer care you are covered for that and if you find someone who wants into the Fall you can than decide to either keep them if they are full time and give the other family LOTS of notice that it is in the best interest of everyone to sever the arrangement as you cannot part with your dog and do not want to put mother risk as well as a full time client is a better business decision over a 14 day and summers off commitment!