Doc Watson's son Merle was once attacked by a festival-goer's dog while he was walking through a campground. The dog bit him on the hands and he was unable to play guitar for several months.

Having your dog around may be a pleasure to you, but if it should bite someone, you'd probably be held liable for the victim's medical expenses, lost wages, and possible punitive damages. Unless you have very good insurance, Fido could cost you your house.

If you really feel like you need a pet at a festival, get a hamster.