"Dog neuter" refers to a surgical procedure that removes a male dog's testicles to prevent them from being able to reproduce or engage in certain hormonal behaviors. Full definition
Male dogs neutered as puppies often grow larger than their counterparts neutered at a more conventional age. (cuteness.com)
This effect appears to be greater in dogs neutered at a young age. (thehappypuppysite.com)
Because testosterone helps to develop the prostate gland, dogs neutered before puberty, will have a very small prostate gland throughout life. (professorshouse.com)