The 5th Limb? (Tails)

Certainly most pedigree dogs like Rotties have their tails docked at a few days old.I don't know about the middle ages idea but in modern times tail docking is all down to the breed standards that the Kennel Club and associated Breed societies use. In reality these are nothing more than Victorian fashion statements that have produced many problems in the various breeds and need to be seriously overhauled.
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I wish I didn't know now what I didn't know then