Coats for our basenjis are dead necessary down here, because they are hot weather acclimated, and when the weather gets cold (under 55 is cold to us), they need sweaters, or coats depending on how cold. Their short hair is not enough. It will become very apparent if your basenji needs to be coated - like mine, they will shiver and try to stay on you, or leaning on you, to keep warm. I would think that if your dog runs around and seems to be enjoying him/herself no matter the weather, they probably are fine except if they are going to be out for long. Because the roads are salted in winter up north, booties might be a good idea, not for warmth necessarily, but because you don't want that rock salt in their paws. In all cases, better safe than sorry.