This is a terrible place to try and search for a missing person. You can drive a couple of miles from Alpine in any direction and literally be out in the middle of nowhere.
For some reason I think he may have headed east out of town on Hwy. 90 and then either continued towards Marathon or veered off on 67 and headed up into the hills. The Alpine landfill is also out that direction.
Cell phone towers are almost non-existent when heading that way, and it makes sense that his phone may have pinged on one of the very few in that area. The signal may have traveled for many many miles before it finally hit the tower though.
There are dirt roads, farm roads, and atv trails scattered everywhere along the entire stretch of highway. I would think that after the initial swell of searching yields no results, LE and volunteers will literally have to both drive and walk along the highways while looking under things and inside of things such as culverts and low lying bridges.
I think whatever happened took place at his residence, due mainly to the dog running around loose and that being the last place she was seen. The fastest way for him to hightail it out of town and get clear of the city limits would be to take the direction I mentioned. So how long would he drive ? I think he would have driven at least 5 miles outside of town, not not more than 15. At that hour of the morning there isn't a lot of traffic, but there
are Texas Highway Patrol cars out as well as Sheriffs deputies. He wouldn't want to risk getting pulled over with a girl in his car that was either beaten up really bad or even worse. Every minute he was on the main road there was a chance he could be pulled over. At that hour of the morning everybody gets a once-over when passing a patrol car. He likely was in panic mode and all he wanted to do was pull off the road and get her out of his car. I think she may be closer to the city limits than people would think, but definitely not in a inhabited area.
Rf has lawyered up and refuses to participate in the searches, so to say he is acting guilty is a huge understatement. I'd love to be a fly on the wall while watching him pace the floor and peek out of the windows all day long. He's got to be living a tortured existence right now, knowing at any second a caravan of police cars could pull up out front with sirens blaring and guns drawn.
map here:
https://www.google.com/maps/d/viewe...hread.php?31&mid=19RLQS68va30_91opQbe2DdU5BRU