I carry a Glock 31, but I plan to carry a pepper jet as well when I hunt in deep woods or other areas where animals are the most likely threat.
Kimber's "PepperBlaster" is a great choice for this sort of thing:
http://www.amazon.com/Kimber-Pepper...?ie=UTF8&qid=1394405326&sr=8-1&tag=lsforum-20
Unlike most pepper spray that comes in cans, this one shoots a concentrated stream. That means it goes farther, and it doesn't turn into an aerosol and end up blowing back in your face as much. Finally, it's good for two shots.
I'd really hate to shoot someone's dog when a blast of pepper spray would be just as effective and not cause permanent damage.