I agree, but I wouldn't expect to see dewclaw tracks unless they sink down in the soil enough. These tracks are pretty shallow. Bout the only time I really notice dewclaws are if they are in loose soil or mud, animal was running, or has some significant heft to it. In the 4th picture, there is a small deer track beside it, and you don't see the dewclaw on it either. I tend to side with you on a shod horse as opposed to something rare and exotic, only because everything is not a "black panther" just because you can't identify it. Just can't see rhyme or reason a mini-pony would be in there. Maybe deer_slayer has little monkeys that ride around his place on mini-horseback, keeping a lookout.
Or his yard gnome's have come to life!