Hey my dog Mercedes had similar accident. The tip of her tail broke…and that’s when it all began. It started to bother her after a while and I noticed she would start to lick it. Well the licking turned into nibblilng and soon after that I can home from work and she had bitten the end of her tail clear off. It was brutal! Needless to say we had to dock her tail…not cheap! Mercedes is a couple years older than Diesel and total cost after all was said and done closer to $1200. That was for the vet, the surgon, meds, anestetics, etc. She had to wear a cone for like 2 months i think…now that it’s off she is back to her old self but it’s not fun. Good luck!