Oh, yes...I've cleaned many a blood splatters off the wall from Happy Tail. It can be really hard to heal and if the dog has chronic Happy Tail (heals/breaks open/heals/breaks open...over and over again) the scar tissue on the end of the tail has a tendency to be much more fragile than regular skin.
If you want to save the tail, you can try wrapping it...just be sure the tail gets plenty of time to "breathe" and it isn't wrapped too tight. I've heard people use everything from hair curlers to foam pipe insulation to put around the end of the tail to protect it.
Our Harmony ended up having to have the end of her tail amputated b/c it just wouldn't stay healed. After a year of being "healed" it split back open again with a vengeance and we decided enough was enough. She is MUCH happier now being able to wag her stub and not have it bang into everything.
Before...
After....
