just remmeber collie, you also have to make sure those sneaky shadows dont catch up to you, or that you dont fall for those zombie-vampire-ish-ness mutants evil tricks!
and i agree, i personally want to run off hide in the woods raise and grow my own food and become as self sufficent as possible...
but should this world that the op is describing come about...not even the back end of beyond is gonna save you...
having a dog is good companionship and can be good protection from a hands on kind of intruder...
but folks have GUNS...unless your dog is wearing its bulletproof vest...i dont think theres a breed in anyones wildest imaginations that can stand up to a couple bullets to the chest. and what happens when food gets scarce... its great having the ability to hunt with your dog, a good catch dog is a great idea...but what happens when those wild animals get scarce...what happens when meat is hard to find and youve now got a very large very high metabolism high energy dog to feed as well as yourself.
if your realy worried about the state of the country (and in all truth the world at that point) youd be better finding an already developed sturdy breed for protection and to HELP hunt and get yourself a gun and learn how to use it correctly.
id also suggest learning how to use a crossbow, bow and arrow and sling correctly as well as trapping courses...then start converting your home and land into a small secure homestead capable of feeding you and your MANY MANY dogs...
and as fallout has proven...a dog does you absolutly no good against supermutants carrying firehydrants on a stick, rad scorpians or raiders...
a deathclaw however...now one of THOSE might be a good "end of the world" kind of critter!
i want one, iz gonna name him Fluffy!