Spaying involves removal of ovaries and uterus from a female dog while neutering involves removal of both testicles from a male dog. (puppy-training-solutions.com)
Brightman said that this is an «outpatient procedure that involves small incisions made in the belly button, inserting a scope, and making incisions lower down to look at the ovaries and uterus to break apart any scar tissue, cauterize endometriosis implants, and look for cysts on the ovaries related to endometriosis.» (businessinsider.com)