The best time to spay or neuter a Sheltie is after 6 months of age and before the first heat. At this time, the dog is approaching sexual maturity without any future physical effects, and the surgery is the least invasive, with the fastest recovery. Each dog develops at a different rate, and for dogs that are slow to develop, it is recommended that the surgery be performed at nine to ten months, with specific reference to the doctor’s recommendations.
