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No one doubts that animal prosthetics are doing plenty of good, but is it possible to go too far? Well, there's always the matter of the dog testicles. Researcher Gregg Miller mortgaged his home to help fund his invention of an unlikely prosthesis that he calls "neuticles." The goal was not to restore the dogs' breeding abilities--that's clearly impossible--but rather their "self-esteem." No word yet from the patients on whether the surgery worked.