In this case I totally support the actions of the man who shot the dog.  He was totally within his rights and it was highly inappropriate and inconsiderate of that woman to have an unleashed dog running int he park.  The man asked her to restrain her dog when it attacked her and she failed to do that several times so she had fair warning.  I'm sick of dogs running wild and attacking innocent bystanders, often resulting in grave bodily injury or death.  Somebody needs to do something to stop this problem.