Friend Amy drove north this morning to go on the Arastradero Preserve triple looping trail with the Dawn Jogger, accompanied by her two chihuahuas, Rosetta and Lucy. Even with their small stature and short legs, they climbed the hills just as ably as Cassie the Australian Shepherd did in her prime. Yes, it was nice to have companion dogs on the trail. No, she’s not ready for a new dog…