Fall is in the air at our national parks, and as the temperature begins to dip, the leaves begin to pop with hues of orange, red, yellow and purple. Of course, autumn likely means more time outside for Fido, too. At these dog-friendly national parks, there’s no better time of year to visit with your pooch. Keep in mind that with fall foliage comes large crowds, so be sure to allow adequate time, check permit requirements, or try visiting on a weekday.