Spaying helps prevent uterine infections and breast tumors, which are malignant or cancerous in about 50 percent of dogs and 90 percent of cats. Spaying your pet before her first heat offers the best protection from these diseases. Neutering your male companion prevents testicular cancer and some prostate problems.

Do female dogs calm down after spaying?

Does Spaying a Dog Calm Them Down? Yes, in most cases. Since they're not competing for attention in regard to mating, and certain hormonal protective instincts are removed.

Do female dogs change after being spayed?

When a dog enters heat, the hormones in her body change. This fluctuation can cause some dogs to become irritable or stressed, and may cause her to act out. Once a female is spayed, behavior tends to be more level and consistent. An unspayed female dog's hormones may also cause her to display guarding behavior.