I have a heeler with his tail in tact and I must say.. part of the reason they docked the tail on Queensland heelers was to hide their true heritage back in the day... is my understanding.

You know many people think the bent tail on cats is a break... it's actually a sign of inbreeding. IMHO... there is MORE to this practice than meets the eye... in it's origin... and people ignorantly follow suit instead of looking at the actual function.
No way NO HOW is a heeler gonna get his tail stepped on by a cow! What kind of dog lazes around sleeping while a giant target towers over it? Excuses is what that is.
Dogs use their tails for balance like a rudder. When he runs and jumps the tail pumps to help him get height. When he lands it circles around like a parasol to help slow him down. When running and switching courses you can see the tail go in the opposite direction for counter balance. Without his tail my boy would look like an average cattle dog. With his tail... he is one of the cutest! It shows of his color has rings like a lemur, makes him resemble a fox, and is sooo expressive of his personality.
The amount of brush a dog keeps in their tail is relative to the kind of fur they have. I see chow dogs keep the whole forest... but my heeler, NOT a single bur or sticker after going through the same area. There are reasons different coats have different textures.
Nena is cute!

My boy is also a red heeler who protects his chickens. His dad was a red and his mom was a blue both with docked tails... but fortunately their owner has some sense.
Heelers are a special breed. I probably won't have any more due to their demanding need for a job. But well socialized and trained, very loving and devoted, obedient dogs!