I assume you are asking about Antelope Canyons. I went inJune when it was sunny. I imagine that if there is poor light you will not get the best appreciation of the canyons.

There was no one stopping one from taking a dog on a leash. It is an overlook so hopefully the dog would not want to leap. Some of the path has limited areas for passing as it is a two way path.

sorry, no idea.

We definitely saw dogs on leash at Horseshoe Bend.

We just went to horseshoe bend a few days ago and no reservations needed. It's $10 fee per car . Great time of year to go is now before spring break! It wasn't overly crowded and we got great photos. We booked canyon X tour a day before our tour but if you're going anytime after March 1 definitely book ahead of time!

I would contact the NPS to verify but it is a very large and paved parking lot. Like Disneyland....

The trail is hard packed all the way to the railing at the edge of the drop off.

Unfortunately, there are no vistas that can be seen from a vehicle...the parking lot is about a 1/2 mile walk to the overlook. There is a large, covered seating area about 1/3 of the way down the trail where your guy could stop & rest. Also, the trail is wide and pretty flat, you could easily just bring a lightweight folding lawn chair with you, and your guy could take as many stops as he needs on the way. That’s what I would do if my Dad really wanted to see it, he has back issues too. Good luck! 🙂

There are also great views at the Navajo Bridge and Glen Canyon Dam that are close by Horseshoe Bend.