Back when i was breeding with B.Davis, I personally did not breed to "Midnight Cowboy" and he was standing right next to me. I was up there to breed o the other 2 "Chivo & Boomerang" but back to the tail curl, that was always a trait of the Cowboy dogs and I have seen probably a 100 or more, and as things got intense it would even curl more, so really it is just a trait from some lines as I can see. I was very good friends with l. Kelley that owned "Divines Jodie" just never put her in his name because we all in the same area and friends. But I have seen him take "Jodie" which was bred from (M.Cowboy x Patty) 3 times and bred her to "Chivo" and watched many of the offspring and seems 95% of them would have that curl in the tail.