Hi
I'm really sorry to hear about your pup's accident. We also had a Deerhound which had to have her tail amputated. The Deerhound was Ardkinglas Pattie (or Beaulah) and she was run over by by lorry. She went under the lorry and amazingly only her tail was caught by the wheels. However, the tail was badly damaged and needed amputated an inch from the base. Beaulah made a quick recovery and never had any subsequent problems with her tail. Hair quickly grew over the end once her stiches were out. The only issue was her balance and turning ability at speed. We hadn't realised till then how much deerhounds use their tail to help them stop and turn. However, she quickly adapted. We never actually showed Beaulah as she was at the time purely a pet. The accident though, which was my fault, spurred my Mum to breed from her as she was shaken by the thought of losing her. So the tail accident turned out positively in the end with Beulah then becoming the foundation bitch of the Cusidh line. I've attached a photo of Beaulah with her pups.
You will be allowed to show Clunie and when the judge goes over your dog indvidually when they normally ask about the dogs age etc I would use that opportunity to explain quickly to the judge what happened about Clunie's tail.
Good luck with the showing.