The fact that you believe so is proof how far gone people are in this society.
My dog = my property. Simply put. Nobody has the right to pet him without permission, whether he is a pet or otherwise. Its just people aren't educated on that and just do what they want. My dog does have a vest stating that he is working and very clearly states DO NOT PET. Would you like to know what happens more often when he is wearing it? People reach for him. Yup. Its like pushing the red button that says "Do Not Push this Button" directly beneath it. More over when I correct these people for petting him, many of them get an attitude with me.