I was taught to always pick a tail also. I grew up showing Morgan's and you never wanted their tails to thin and break so that's why. Now it's just a habit although my mare now has so much tail it wouldn't matter if I brushed it, she wouldn't miss any of it! Ha :) I can't post a pic from my phone but I'll post one when I get on my computer tomorrow. She has a beautiful tail! It very long and full/think all the way to the bottom.