Both my dogs have Homeagain chips. Lou Lou was 4 1/2 ,months and Winchester was 6 years old when he got his. I keep their chip # in my phone book next to the vets number. Both their chips seem to be staying in place, I have the vet scan them everytime they go to the vet to make sure. I have an account on-line with a password that I can update information on the Homeagain site at anytime! My dogs also have Boomarang sliding dog tags on their collars with our info. Our dogs are hunting dogs and often go hunting in other states and we always bring that info with us and vet papers and dog licence info and pictures to prove they are ours just in case they go to doggie jail in another state!