I carry bear spray on my bike, I live in an insanely safe city, but I got it for a dog. One dog who always chased me up a hill. I got tired of it. He chased me I sprayed him, he ran to the side of the road yelping, I went over and sprayed dierectly into his face and mouth for about 10 seconds, before he got up and drug himself away. I haven't seen him since.