I love this idea. Yet, if I were the founders, this is the issue that would keep me up in the night, not just for what could happen to the pets, but for what could happen if a dog bites a child. I don't think the site is for every pet owner, but with a $4 billion US market in pet services and plenty of pet owners who hate kennels, I think there is sufficient demand to make this a success. It will be interesting to see how they offset the risks.