Cathy, you just had a most horrible all-around 'rescue' experiences. I am so glad your hand is healing, but please don't blame yourself at all. Who thinks of all these things when you are adopting a cute dog from the shelter? I have had many basenjis who were "touchy" about their tails, but never such a reaction. I'm sure there are lots of things you would do differently if you could hit the 'undo' button, but nothing that you did was 'wrong' in any way. Try and look ahead and use your sad experience to educate (as you have done to us). As someone said, thank goodness it wasn't your face, or some small child…kids can't keep their hands off a basenji's tail. Like any accident,it all happened so fast (literally, at 60 mph) but it is past and try and put it behind you. Things work out for a reason, even if it makes no sense at the time.
Hugs.