NEVER. Healthy pets, even when they’re older, handle anesthesia quite well. Age does increase the possibility that the patient will have some degree of organ malfunction, and those with systemic problems will be at an increased risk. Therefore, we recommend pre-operative testing on all patients prior to anesthesia. The important organs include the liver, kidneys, heart, and lungs. Recommended tests include a complete blood panel and urinalysis in all patients. Thyroid testing and thoracic radiographs are recommended in all patients over 6 years.