Oops! Totally forget what I said in the ID of the breed. I was looking at the first picture of Charile (the aerial view where his face doesn't look as much pit as boxer/shep to me). Hahaha. Little red dog looks like it could be an Aussie/border/setter mix. Aussie eyes, border body/face, setter or red golden retriever coloring. Definitely a herding breed, all high energy, so I'll bet dollars to donuts he has run from quite a distance. Those dogs seem to know no bounds. We had a border once run 3 miles away and was taken to animal control a half hour away. She was missing for an agonizing 3 days!
I'm glad to hear new boy is fitting in well so far, but I know that breed needs a LOT of attention, work to stay busy or else their intelligence drives them nuts. Our next door neighbor has 2 Aussies and a border. The border never shuts up. I hope your newcomer behaves more like a quiet collie or shepherd.