I know this topic has been discussed extensively, but still have a few questions. My girlfriend and I are starting our first thru hike of the AT in mid June. We have been looking for a dog that could hike with us and we found a retriever/German Shepard mix who we liked a lot. The only problem is that he is between 4 and 6 months old. We still have a month until our hike starts, so he'll be between 5 and 7 months, but is that too young for him to hike the trail? We have heard that it may be bad for him to do so much so young.