I would say that I do not like docking in dogs and horses, however in sheep I find it a necessity. Most sheep owners dock their tails because their poop will get stuck in the wool, destroy it, make it difficult for the sheep to relieve itself, plus it looks much better with the tails docked. All of the sheep at the barn (Yes, I have shown sheep in the past) are docked within the first week of their lives using the rubber band method, which cuts off the circulation in the tail until it falls off.
I think cropping dogs ears and docking their tails is cruel because there is no use for it whatsoever, except for the dogs with longer hair that their feces could get stuck in.
Just my 2 Cents.
Intermediate Rider~Learning Equitation and English Pleasure~Interested in Eventing
A horse will tell you everything you need to know about him, if you listen.