Fur will grow back just like tattoo on human, like on the leg it has to be shaved to be done but hair will still grow over it (*shiver* I had to go nearly 3 weeks without shaving my ankle after I got my first one done! and I'm hair phobic too!) but anyway, I've never understood why tattoo an animal thats gonna grow hair over it unless they keep it shaved. I think for id purposes the chip is thousand times better! (or a friggin dog collar? everythings gotta be extreme these days)