Gregg Miller, the inventor of Neuticles, says his dog did behave upset after he was neutered. While there's no study to support the claim that dogs miss their testicles, many pet parents complain of behavior changes after the neutering procedure. These changes include loss of appetite, sleeping all the time, and hiding. Depressed dogs also show all these signs. The loss of a body part is something that neither humans nor animals can ignore. That's why there's a strong belief by many in the dog community that dogs do miss their testicles after they are neutered.