Police-issue OC works well. I have had several large, viscious dogs (including a pit bull and a Rot) turn tail when hit in the eyes with it.
Member: Orange Gunsite Family, NRA--Life, Varmint Hunters' Assn., ARTCA, American Legion, & South Cuyahoga Sportsmen's Assn.
"Gunnery, gunnery, gunnery...all else is twaddle!" --Admiral Sir John Fisher, RN