I love the black Chow, GS. I have one just like him. He's the most protective / loyal dog I've ever owned.
I carry dog treats in my work truck. In the summer, as I go about my lawn mowing route, there are certain dogs (some are customers' dogs and some are their neighbors') that go crazy as soon as they hear or see us pull up.
There's one street where we have about a dozen accounts, and two of the dogs there follow us down the street. They don't listen when their owners call them back.