I want to know the answer to the following question:
In neutering, what is removed in a male dog?
All the background I'm provided with is that "Because of the overpopulation of dogs in some countries, many animal control agencies, such as the American Society for the Prevention of Cruelty to Animals (ASPCA), advise that dogs not intended for further breeding should be neutered, so that they do not have undesired puppies that may have to later be euthanized.". Is that enough to answer the question?
Answer: no