Here in Kansas City, you can purchase o.c. pepper spray from law enforcement uniform and supply stores. And the label says "sold only to law enforcment and security personel only. And I have worked as a armed security officer. However, whenever I walked in to purchase it, they never questioned me. I do believe any resonable looking adult can purchase it over the counter and these places. I even took a one day class in its use, and then gave a class in its use. I carry o.c. pepper spray when I go out on my bicycle, (two legged and four legged dogs, I don't care, I'll use it) Just keep in mind, to let the dog(s) get close withen raange when you spray them, and spray the eyes and mouth. (same with people) . Keep in my the wind factor, so it doesn't blow back in your face. And keep in mind that it might take a couple of seconds for it to affect the subject, so give your self and exit,or some backing up room in case it doesnt work, or their is a delay. Always give yourself and exit. But the odds are, oc. pepper spray will stop a dog attack, or human attack. I have used against dogs successfully.