My dog was tattooed. She got lost one time, she had got a bath and we forgot to put her collar back on. Somehow the gate got opened and she got out. We called vets and were told that most places do not look for tattoos, and got lectured for not having her collar on. Well the people who found her put up poster and after a week we saw it. I went over to find out she had a friend coming to take the dog that day. I told her this was my dog and I could prove it by the tattoo. Her friend argued with me until I showed her the tattoo so it helped me get my dog back.
When I get another dog it will get tattooed also.