What weight blanket should I buy? I will probably only use it in the rain or snow, since he never seems cold in dry weather. I have heard that a blanket can press down the winter coat and make it less effective. If that is true then I can't get just get a light weight blanket to keep him dry and count on his hair to do the rest. Our average low temperature is 28 F. We usually get at least one or two good snows.