Castration of males and spaying of females is performed under general anaesthetic by our veterinarian. Your pet will be required to be fasted overnight to prevent any problems during the surgery. Castration of a male involves a cut into the scrotum of the dog or cat to take out the testicles. Spaying involves a single cut into the belly of the female to remove the ovaries and uterus. Once the anaesthetic has worn off, and provided there were no complications, your pet should be ready to go home in the afternoon.