I've always had more than one dog and they all seemed to get along. The exception being that the male and female alpha will not give up their place. You should always put your first dog's bowl down first and call her/him and then the others as their pack order. My dogs always get along, but I make sure to follow the pack order. As for walking more than one dog, yes, it's a bit harder on leash. But being in the country, I'm fortunate that the bush and trails are only a few hundred feet away and they can all be turned loose. They get more exercise together than the solitary dog who tends to stick by you. As for coming from a hotter country, I wouldn't worry about it. We (the general public) import dogs from all over without any ill effects. The dogs will groww thicker coats and get used to it.