We sold all of our puppies to homes with a spay/nueter and microchip contract. All the pups are required to be chipped no later than 6 months and earlier if possible.

The reasoning behind this is two fold.

1. If your dog is lost and they are found and taken to a kill shelter, with no identification the dog can be exterminated within 24 hours. If they have a chip then the owner can be contacted. This is just my state. I don't know about other states.

2. If someone steals your dog and you discover who and you go to court to try and get the dog back, you better have a way of proving the dog is yours.

The microchip is soooooo small that even the tinest dog can be chipped with no ill effects. The only thing I have ever heard of concerning the chip is that sometimes it floats and doesn't stay in the spot that it was injected into. In these cases sometimes the dog needs to be rechipped. This usually happens if the dog is still in a major growing period when the chip is initially installed but these cases are so infrequent that they are not even really worth worrying about.