Are Dog tattoos cruel or prudent?

An ID Tattoo in the ear is prudent.
"This is Animal Cruelty!" I just pray the dog was unconscious when this was done.

I love tattoos, I even have a couple so please believe me when i tell you that tattooing your animal is not cool it's cruel.

Dogs are not part of the decision therefore this is not an option for the animal, i.e. cruelty.

It's okay if a human want to create pain for themselves with tottoo, but you given the dog no option