Fashion and function? Heck yeah! These cooling bandanas are great for summit selfies and keeping your dog a bit cooler on the trail. Just soak it in water before tying it around your pup's neck to bring down the body temp a bit. You must use your best human judgment, of course - bring plenty of water, and if it's too hot out for your dog, leave them at home!
Pro tip - make sure to tie a square knot, rather than a granny knot, to keep the bandana tight.