According to AKC:
Docked to a medium length and carried slightly higher than the level of the back.
I really like Momo's 'nub' (lol) length. I think it's perfect...2"...not sure tho cuz he's sleeping downstairs & I like keeping his hair long on his tail.
Mimi's is 1.5", wish it was longer so her tail hair doesn't get wet when she pees.
Did everyone go measure their baby's nubs before posting?