Hi Indie. It was the very tip that was injured, right? The rest of the tail is okay? I googled "dog tail tip injury". They really seem more concerned about injuries further down being more dangerous to the dog. But any will take a long time to heal because the tail is very vascular, like 6 months. Is puppy chewing on it? You need to prevent him from doing that, like with one of those lampshade collars. And they said to change the bandage every 2 to 3 days. I guess they know the dog isn't gonna sit still for it. Do this google if you haven't already, there is stuff written by vets and regular people you should find helpful and consoling.