We had a JRT cross who lived to be 18, never knew what she was crossed with but there was nothing terrier about her character, the same for Jay our 7year old full JRT, I've seen amouse walk past her and she hasn't batted an eyelid!! Scruff our 3 year old terrier cross is great fun and very typical. She digs , sniffs everything, and shakes everything[including my underwear]. Moll is a fab dog, doing everything Springer style. Are any of yours not typical of their breed?