Spaying benefits include: reduced risk of mammary cancer if spaying is done at an early age, as well as prevention of urine marking and heat cycles. (pets.costhelper.com)
Research indicates that female dogs who were spayed before they went through a heat cycle had lower risk of mammary cancer in later life. (puppys-place.com)
Spayed females have a lower risk of mammary cancer (90 % fatal in cats and 50 % fatal in dogs) and life - threatening uterine infections. (pawsofmichigan.com)