National Pet Network
   Offers pre-paid registration to assist recovery of lost animals.
   http://www.nationalpetnetwork.com/

Tatoo-A-Pet
   Offers a registration and recovery service which utilizes a permanent and painless tattoo identification.
   http://www.tattoo-a-pet.com/

The Cordless Tattoo
   Offering a battery-powered pen for animal identification. Includes details of accessories including a canvas wrap to restrain small pets.
   http://www.cordlesstattoo.com/