Is Yosemite dog-friendly?" That's one of the questions most commonly asked by DogTrekker readers. The answer depends on how "Yosemite" is defined. The famous national park comes immediately to mind, but the rugged Sierra Nevada landscapes that define it don't suddenly end at its borders. The Yosemite Region, encompassing the three counties (Mariposa, Tuolumne and Madera) that converge in the park, harbors many other places to see and things to do—and it's definitely dog-friendly!