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Buy Bear Spray. It will typically go 20' or more. Cans tend to be about the size of a Nalgene waterbottle.

Chest Rig to hold the can, which could also be used as a belt or sling. I realize this may be the equivalent of tactical vest carry of a handgun but it will definitely keep you safe.

http://www.cabelas.com/product/Counter- ... 462&rid=40" onclick="window.open(this.href);return false;

This is the spray itself

https://www.google.com/shopping/product ... PwBEKYrMAg" onclick="window.open(this.href);return false;

Then of course there is this spray about the size of a pen

https://www.google.com/shopping/product ... MsBEPMCMAU" onclick="window.open(this.href);return false;

I doubt very highly that the pen has the capacity or range you are seeking but it undoubtedly fits the definition of small.