Regarding the tails I have mix feeling.
 
I always thought Buffy's tail was too short, but sooo cute. 
When I got Duncan the breeder told me over the phone that the vet had cut his tail too short, so I thought no big deal its little like Buffy's. 
Way wrong Duncan's tail is maybe the size of the top part of my little finger, it does not wag and will not grow or will ever wag the nerve was damaged   

  .     
I cried at first for him, but after a while he made it ok.  I can tell when he is happy or excited about something without having to wag a tail . 
So for this reason given a choice I would say "Leave The Tail Alone, Thank U"