Dogs generally began experiencing puberty at the age of six months. If preventing unwanted litters is an immediate concern, it is best to have the procedure performed by this age. While it isn't advisable to perform the procedure on a newborn puppy, it is best to take care that the surgery is performed before your pet reaches sexual maturity. Once male pups are eight weeks old, it's likely that their testicles have fully descended; this is a necessary condition for performing the surgery. Professionals typically recommend scheduling the neutering procedure when puppies are between four and sixth months of age, although specific breed and physical health/maturity can play a role in determining the most appropriate age to neuter.