Large dog chassed me the other day while I was peddaling my tadpole low to the ground trike..stopped just in time to avoid hitting a parked car...gave dog a blast of a high decible marine horn and that did it...went by the same place today and dog was loose in his yard but just looked at me.
Happy..have it taped to the handelbars with black electrical tape so I cant see the brand right now...its a small one but they last a while and are loud..body of canister is 2 1/2 in dia about 3 1/2 in long ..top with cone about 2 in..cost 9 or 10 bucks..