Ours is part Border Collie also! I think that's where her white bib comes from and maybe her white feet. Yours has a white marking on her nose (although much smaller than many Border Collies). Our Molly is part Rat Terrier and part Beagle so she's really good at finding mice, shrews, voles, moles etc. (Her Beagle nose and her Rat Terrier "catch it" instinct can be good or bad...she follows the trails of the rodents and digs....surely she'll find it. It's very frustrating to her when we stop her. Unfortunately, DH usually encourages her. Our lawn looks really sad, but we haven't had any mice get into the house since she was old enough to keep them away!)What breed is your dog? The lady I got him from said Border Collie and McNabb but I don't see it.