I had a 8 year old male dog and when I got married, my husbands 8 year old female dog moved in and everything was fine. (littledogtips.com)
SSS is most often seen in older female dogs of certain breeds, including Miniature Schnauzers, Dachshunds, Cocker Spaniels, West Highland White Terriers, and Pugs (healthypets.mercola.com)
Spaying before maturity significantly reduces the risk of breast cancer, a common and frequently fatal disease of older female dogs. (pets.georgetown.org)