Is it theft of service to walk out of a business (contract) for service without paying for something they should have already performed? (Sorry I had to write that a bit weird for Avvo to pup up correct categories to choose). A month ago I took my dog to a vet due to a problem with the dog choking. The vet couldn't do anything but prescribe a drug. She didn't ask me if I have any additional concerns about the dog and just walked away. They made me pay for a full exam, but she never looked the dog over and missed something. Now they say for me to come back for the doctor to see what she missed, they will charge me for another exam. If I show up and have the doctor look at what she missed (balding spot on tail), what can they do if I just walk out without paying with the argument I already?