Doesn't matter how you bring it on IMO. Why do you think the Fell & Moorland have to rescue some old lady's pet jack Russel because it's gone to ground sonewhere. It's in there blood, there breeding. Even some of the show shit will slip in sometimes. It's just in them. They are terriers after all. Not trying to put you off at all, But if you do decide on a Terrier then you have to be prepared for it.