d k: There are dog-mushing rangers in Denali, NP (who also do summer-time demos for the visitors, but I’d guess YNP leans towards keeping all canines out of the backcountry. And there’s not the historic tradition of dog mushing in Yosemite the way there is in Denali. Ah, found a citation, “Denali kennels manager David Tomeo noted theirs is the only sled dog kennel in the entire federal government.”
I’m pretty sure a guided or private party couldn’t take their own dog teams through there like they can in Denali. That’s a pity, because heading over Hwy 120 or the unplowed portion past Badger Pass towards Glacier Point would be a really cool dog mushing trip although I can imagine conflicts with our trail users (sled dogs are quiet when running but yap a lot when in camp).
There are other unplowed, mountain-pass state highways in California that I assume would be open to dog mushing in winter.