I found a site, petfriendly.com very helpful when if comes to the petfriendly places
along the way, it lists campgrounds, dogparks, dogbeachs, etc, (even motels) whatever you need for pet friendly advice.
I'm a fulltimer with my two Italian Greyhounds. I'm parked in an RV retirement resort park. I have a 2000 Cameo Carriagelite and I love it. I'm not going anywhere soon though, I don't have a truck yet to pull it with.
When you make it into Arizona I hope you make it during winter, then you would
have no problems with the heat and the dog. This week we are into temps of 113 and my a/c is not keeping up, although it is warm inside it is still hotter outside. I did put the heat reflective window tint on and that helps. We keep the upstair slider door shut so we are only cooling the livingroom and kitchen area. My unit is just a 29 foot fifth wheel but I definately will have to make some plans for additional a/c. I don't go anywhere during the day because of the heat in the rv. When I go to the
store it is real early in the morning and I'm back by 9:00 so that I might monitor the
situation in here with my dogs. When I go back to work next week I have made
arrangements for them elsewhere for fear of a power outage while I'm at work.
As soon as the sun goes down the a/c works fine and keeps up. Hope that helps in
your trip plan.