This is a classic example of why pet owners need to do pre-anesthetic bloodwork. Regardless of how many times the dog has been put under anesthesia, pre-anesthetic bloodwork can help the veterinarian determine if the pet is healthy enough to be put under- ESPECIALLY if they are older pets. I am a registered veterinary technician here in NC as well as a licensed veterinary technician in Virginia & I have had to deal with clients that refuse to do any testing on their pets and then blame the vet for any complications. Would you want to go under anesthesia with out having any testing done to see if you can safely go under? I don't think so.