I have been blessed with the addition of a puppy, Leo. I had a microchip put in under his skin at the same time he was neutered as part of the first year of puppy care. I chose the company Petlink for their one time fee, $42.00, for life-time coverage. The identity library of information is available online, 24 hours a day, seven days a week worldwide for the life of the animal. This is also a worldwide company, which is handy for anyone who travels outside the US with their pets or any animals.
The competitor company uses a microchip placed in the same manner but has a yearly fee to keep the data in an available library for retrieval. Est. $35.00. Most Veterinarians carry the yearly fee company because the company gives them the startup supplies for free. Petlink, has a start-up cost for equipment to the Veterinarian, & costs are made back as microchips are registered. The Petlink site has lists by State, of Veterinarians who carry the Petlink microchips.
Check out this link to find out how many lost pets are never returned home and the importance of microchips.