I've met many hikers with dog in toe telling me the dog is security, as well as a companion. The chances of the two finishing a thru is very small. In fact, I personally don't know anyone who has done so, but I'm sure a few have made it. I hiked the entire AT with my .380 and I bet it was lighter than anything a hiker had to carry to support a dog, even if the dog carried some of the weight. I would tell these hikers to leave the "security dog" at home and learn to handle a firearm and take it.