I'm not an expert, so I looked it up on the web, as you recommended. It appears to me from this site (and others I saw) that, in fact, ticks that attack dogs do cause Lyme disease. The disease cannot be passed from an infected dog to a human, but a tick can make its way into a home (or a hotel room) attached to a dog. http://dogs.about.com/gi/o.htm?zi=1/...com/index.html

In my opinion, hotels which invite pets bear a responsibility to assure their other guests, without pets, that they will minimize pet-related issues, such as noise, odor, disease, etc. I assume that the extra cleaning fees are charged because the property takes extra-care and effort in cleaning, and not as a profit-center.