I have only kept patterdales for three years. I had a am staff when I was a kid (best dog ever , he would try and chew down the biggest oak tree in the timber just to get a mouse) . I got my adults from my father, he got into patterdales back in 1999. He has a real need for them since he keeps alot of free ranging chickens and has problems with mink, skunk, racoons, opossums and coyotes. Everything loves chicken. My male is about 19lbs and my female is about 14.5 lbs.