Both of my dogs are microchipped and$15 is a real good price.

There are two types of microchips that run off different frequencies. Most shelters and vets in the United States have the Avid or Home Again microchip scanners that run off the same frequency. The Banfield microchips run off a different scanner and are not as widely distributed in the United States, although they are more widely used in Europe. As long as they are using the Avid or Home Again - you are pretty covered in the United States.

As far as registering - the price of the chip puts your dog in a national database. You can also purchase additional coverage for about $15 per animal (for the life of the animal) that will give you even more protection by including more of your personal information in case of emergencies. I purchased the additional protection and gave my sister and vet as secondary contacts to make sure that if I was unreachable for any reason, there would be someone to authorize emergency vet care. With additional coverage, your chances of being contacted quickly improves.

On most dogs and cats you can't feel the microchip, although on some of the leaner breeds (e.g. greyhounds, whippets, etc) - you might be able to feel it. I have a friend that has an Italian Greyhound and you can feel the chip between its shoulder blades.

Hope this helps

Clara