When I got Lola back after her spay my previously potty trained puppy was having major potty accidents and once even peed on my bed with no indication she was about to go. She even look surprised that it happened! I was so upset, I was convinced they had really messed something up and ruined my baby forever. When she went back to the vet the next day they took a urine sample and when it was normal they decided that what they called the "uterine stump", cervix I guess, was swollen and pressing on her bladder. We were sent home with some metacam to reduce swelling and she was normal in about a day. I have been happy to have the leftover metacam around too as it has come in handy for minor injuries and after shot soreness.