Its true that some Travellers wouldn't steal a dog. Not all of them are too bad, I went to school with some and they were alright, but still I wouldn't call them good, especially not to their animals. It depends what area they are from also. The families that are "concentrated", tend to be worse than those travellers from families that have some settled people in their lineage. (lol, I sound like I'm talking about breeding dogs! haha)
My 2nd cousin is a quarter knacker, she dosn't know it though, she's about 7. Her dad was half knacker, apparantly he's a git.
But anyway, good luck findin