Unfortunately some of the Hooligans have been diagnosed with CES ... JR and his two offspring Ringer and Honey were all three diagnosed with CES. Currently I have Slider (JR's great/great/great grandson) who was recently diagnosed with it.
I'm not sure I can answer your questions but I can try.
This is an example. The litter had 7 males 3 females. All the females tails are normal. I think about 4 of the males tails look funny. In the photo, the back pups tail is just a little short however it is very obvious that the pup up front has almost a docked tail. Even if these pups are mixed, what would cause the tails to be of different lengths?