Oops—wrong thread. There’s another thread running with the story of pitbulls attacking a woman walking her German Shepherds—and her saving herself with the knife that she was carrying.
I have a friend who was a missionary in Russia for seven years. He routinely defended himself against dogs with a pocket knife.
In addition to poop recovery tools, for my after supper dog walks I like to carry one of these:
Benchmade 580SBK Barrage Spring Assist Axis Lock (3.6" Black, partially serrated blade)
And one of these:
Surefire E2D LED Defender