The best bitsa cross dogs I've seen graft although when I say graft I mean ratting bushing ferreting and so on not digging. Was a cross bred mongrel of a travellers site my brother had it ,I think it was a cairn terrier cross God know what and was a real good busher and ratter. . Although none of them are bred with any fore thought it's just where they let to run and anything can get across a bitch.