The decision to spay or neuter your pet is an important one for pet owners. It can be the single best decision you make for their long-term welfare.
Spaying/neutering is one of the most important pet’s health decisions you make
Statistics says that pets who live in the states with the highest rates of spaying/neutering also live the longest (18% for male dogs and 23% for female dogs actually.)
Medical evidence indicates that female pets spayed or neutered before their first heat are typically healthier. Pet's spay and neuter reduced risk of certain types of cancers what increase longevity of altered pets. Also unspayed female cats and dogs have a far greater chance of developing pyrometra (a fatal uterine infection), uterine cancer, and other cancers of the reproductive system.
And you can be sure - getting your pets spayed or neutered will not change their fundamental personality, like their protective instinct.