I adopted my dog from the local shelter. They had to remove the tip of her tail because she had a happy tail so bad that she had bone deep cuts. They had first tried to stitch the wounds, but she popped the stitches and made the wounds worse. Thankfully, she doesn’t have the happy tail affliction anymore. I guess that ‘happy’ is a misnomer. Her excessive tail wagging was more of a stress/anxiety behavior.