CONSTANTLY!!! My Little girl is just 3lbs in weight and i'm always a bit nervous when out walking her...some days i don't walk her in public at all and just play with her in our garden..i'm VERY aware of the risks (my last yorkie was attacked) and i am always looking over my shoulder...sometimes i wish i could relax a little but im too afraid to let my guard down for even a second, I tend to avoid the more popular dog walking areas when out with her as too many people let their untrained dogs run free.