When Rory was a pup she was the queen of tail bleeding. She busted it open countless number of times, blood squirting all over! Then when you try to badange it up, they get excited, wag again adn off comes the bandage, that is if they dont rip it off first.
The good news is it gets better as they get older. But even know she has a bump on the end.
You need to do whatver you can to keep it bandaged, I used square gauze pads and medical tape but be careful of the hair, sock coem in hands as covers. The vet cant sew it up, tehre isnt much they can do expcetp amputate it if you think its neccessary. I put neopsporin on it twice a day and here's the biggie.....
Dont get yoru dog excited, ha ha! I know that sounds hard, we'd have friends come over and we'd say "ignore the dog" I felt so bad but it was for her own good. Good luck