- In "Dog Owner's Home Veterinary Handbook" Debra M. Eldredge et al. state that male neutered dogs will not develop cancer of the sexual organs, will keep the prostate at a healthy size and will be less likely to develop anal sac tumors (perianal adenomas).
- Female dog neutering (also called spaying) reduces the risks of breast cancer and removes chances of ovarian cancer, uterine cancer or a potentially lethal infection of the uterus called pyometra (where the womb fills with pus).
- According to Mar Vista Animal Medical Center, since the dogs will not be driven to find a mate, neutered dogs are less likely to wander off or fight other dogs.
- Mar Vista Medical Center also reports that half of all neutered male dogs stop marking their territories with urine. Mounting other dogs (male or female) is stopped in 7 of 10 male dogs.
- Dogs will not get fat if they are neutered. They will get fat if they are overfed and not given enough exercise.
