I traveled with two Belgian sheepdogs who had trouble coping with very hot weather. I would go places in the early spring and late fall and winter months when this was not a problem. It would have cruel to take them to hot areas in the summertime. Now if they had been a couple of Chihuahuas it would have been different. They were great mountain dogs with good endurance and as a herding they wanted to keep us, their "flock" in sight so we did to have to worry about them running off (for days at a time) as with a hunting breed.
With the death of my last dog we have not gotten another because it is too restrictive for traveling as we are still physically active and go places where we would have to leave the dog at home. I used to do that with my dogs and paid for a house sitter to take care of them and watch the house and take care of the plants, etc. but now all the watering and bird feeding is automated and we have an alarm system so there is no need for a sitter.