My 2 month old puppy that I adopted last week seems to have a section of her tail that is swollen. It's about 2" from her body and only about an inch of it us swollen. I was thinking that it may be an injury from when she was younger. Maybe sine how that joint in her tail was injured. It does not seem to bother her at all. She still wags her tail non stop. You can even touch it and it does not bother her. She leaves it alone to.