Has anyone ever used a .22 pistol in a self defense situation?

I usually carry a 9mm or a .40 on duty. When I go jogging on the back trails I tend to carry my walther p22 .. not so much for defense against people.. but more so against wild animals. We have had a lot of sick animals around the area so I am weary/ the occasional mountain lion. Anyway carry nothing but Aguila Super max.. if you are familiar with it (nearly 1800 fps from a rifle and almost the ft lbs of a 9mm at muzzle). Anyway I was jogging down the trail when a 140 ish pound stray rotty made an advance at me. I had no other choice but to shoot or get ripped apart.. ( I love dogs and all animals and was very upset by the situation) Anyway I fire off 3 rounds while it was in mid-jump and it landed on top of me dead (just like a movie). Thank god for Aguila.. I doubt any standard .22 lr from a p22 would have stopped an animal of this size. One round went through the right lung and out the side. One struck the belly just a ways up from the back legs, and one (probably the one that saved my life) struck him just above the left eye. Even being a trained professional.. I really doubt I could have gotten 3 shots off in about that 1 second time frame with a 9mm or a .40.. Anyone else have any first hand experience with stopping power of a .22 in a similar defensive situation??