http://www.youtube.com/watch?v=roH9EDUu7xU&feature=em-uploademail It may only happen to dogs prone to eczema...or sensitive skin. I know I've let Jose` dry without blow drying him and sometimes it takes a long time because he has quite a dense coat. Nothing ever happened. But it could. And when I think back to my Lab, Bonnie and how she'd swim in the lake and take all day, hours and hours to dry through and through. Nothing ever happened to her either.