I shit you not, bro. The vet that invented them is in Independence, MO. A few years back after he got the patent approved and was ready to release them, the Johnny Dare and Murphy (KQRC) morning show had Johnny's Dingo neutered and had the 1st set of "neuticals" ever implanted. Reportedly, "Elvis" to this day still thinks he's got his original package.
Talk to your vet about them.
Here's the website:
http://www.neuticles.com/index1.html