It's been estimated that over 80% of U.S. dogs are spayed or neutered (hereafter referred to as neutered) but according to the AKC (American Kennel Club) there is no "one-size-fits-all" solution for dog owners or veterinarians looking to make an informed decision on if or when to neuter a dog. Reasons to neuter include controlling the pet population, reducing the risk of mammary and prostate cancer, and decreasing undesirable behaviors such as aggression and roaming
Consequences of neutering vary depending on factors such as exactly when a dog is neutered, whether the dog is male or female, and the breed or size of the dog. An owner would be wise to review the literature at akcchf.org/research and to consider the resources available through the American Veterinary Medical Association such as free webinars and additional literature review.
The decision whether to spay/neuter a dog must be made individually considering the pet’s age, breed, health status, intended use, temperament, and the household environment as well as within a sound veterinarian-client-patient relationship.