I was born 'overboard' protective, so not much change here.
After several scary encounters with loose dogs, I would say that I am more on edge. Our local paper had an article this week about a Chihuahua who was out for a walk in his neighborhood, on leash, and was killed instantly by a loose dog.
I drive the boys to an office park to walk daily. My sense of security there has been undermined recently by a couple of loose dogs. One was a very large Boxer mix running off leash with his owner riding a bike behind him. The other was a huge dog whom we have encountered twice running from a restaurant patio.