Why would you want to do that?
Unless you want to spray a dog that is attacking you!It will get you into more trouble than it is worth.It tends to "Pi$$ Off" criminals,who will then get angry with you,and take revenge!As you fumble in your pocket or purse(you WILL be very frightened!)for your "spray" the criminal may feel more threatened than you! He may think you are going to pull a gun from your purse.Then he will shoot you first!
Stay out of dangerous areas.Don't wear gold,watches,cell phones,or carry cash.Don't get drunk in public.Be with friends when you go out.Don't take public transportation.Go home early.