Neutering, or castration, is the surgical removal of both testicles in male dogs and cats. (risiusfamilyvet.com)
Neuter: A neuter is the removal of the testicles in male cats and dogs. (scenichillsvet.com)
Although the surgery for either sex can be called a neuter, most of the time neuter is the term used for the surgical removal of the testicles of a male dog or cat. (sbhumanesociety.org)