My daughter has a Greater Swiss Mountain Dog. The vet wanted to spay her at six months but the breeder insisted that she wait until she was a year old. My daughter went with the breeder's suggestion because he has been raising Swissies (large breed dog) for many years.

My co-worker has a lab. Her breeder also said to wait until her puppy was a year old. Once again, the vet disagreed but she followed the breeder's advice.