Hi. I am new to pitbulls. I recently took home a 7 week old pit and the dad was "razor edge" and the mom was "white rhino" UKC pitbull. He was all black pick of the litter the biggest one out of 10 puppies. The day after I took him home I noticed his tail was curled above his back all day. When he is resting or sleeping its down, but most of the day curled. I read on google that means he could be mixed? The breeder I bough him from said it means he is alert and focused, and will go away. I wanted you opinions. This is a big deal because I paid a lot for him because I needed a big pitbull. We live high in the mountians of colorado and mountian lions are a huge threat. My neighbor has a ukc pitbull that is 120lbs and killed a lion last month that got into their garage. We bought this pup to be a spoiled family dog and go on 10 mile runs with my wife and take care of himself if he has to. I am not saying I got him to fight lions, but they are all over up here.