Years ago our dear Penny Black had a "Frozen Tail" Instead of being waggy it hung down as though paralysed. To begin with it was painful and she was given anti inflammatories and pain killers.
She was entered in an open agility show that weekend. We were late getting to the show, Holly had no time to walk the course and still not sure whether to risk it.
They risked it and won the class beating the 144 other competitors by two whole seconds. What a team!
She has never had a frozen tail again thank goodness.