Dogs are not very welcome in National Parks. They only places they are allowed is in campgrounds and along some roads. You cannot take them on trails in any National Park that I know of nor can you take them on boardwalks in Yellowstone. In Glacier National Park they attract bears. We have had bears in our campground in Glacier NP and bison in a campground in Yellowstone. Not a good idea to leave them alone in your RV or to take them out strolling.
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