It's done for identification purposes. Do you know if the people you adopted the pup thru had it done or if it was already there? If something were to happen and the dog got lost anyone finding it could trace down the owner. That is one possibility. Could be an ID system that was used to keep track of dogs in a puppy mill type situation too. Racing Greyhounds are tatooed in the ear. Do you know anything about the dogs hisory?

Lisa

Lisa,
Thank you for your info on my chihuahua. I think she was in a puppy mill and that was her ID. Not much known about her except she was in two kennels. She is very clean, about 3 years old, had all shots, house broken, is very smart and has adopted my wife and myself.Thanks again Lisa.

my chihuahua wanted a tattoo of a scull on his ear, i said no way!