I've seen dogs wearing booties in -20F weather, too, but I've never seen a self-respecting dog that would wear any such thing because their owners wanted them to wear them just to keep their floors pristine. Dogs only perspire through the feet (and tongue - the reason they pant), so putting booties on them when it's warm is going to get mightily soggy and uncomfortable (and likely the reason your pooch got a foot fungus). The booties would be better on EC's hands.