I am very wary when out with the dogs , i get cars pull up at least once a month if i have the bitch with me , not so much if i have the dog with me though , people usually just want to tell you they also have a greyhound
I do try to walk in different places with them & i am not a creature of habbit so the times also vary to suit what i am doing , which i think helps , all you can do it tighten up security and stay alert , note everything down & always have a compact camera in your pocket for quick pics of vans / cars reg numbers if you feel there watching you