Yes we have to cinch them down pretty tight on the ankles or they will lose them in the snow. Our rule of thumb for boots is 0 or below and they go on, otherwise they can't keep their feet on the ground long enough to do their business. Lately if it's -5 or so and they're just going for a quick potty we don't put them on.Vader has worn booties before, and removed them every time. I only have 2 left! He seems happier without them. He's only been cold a few times, usually when we are going slow and stopping to chat. He feet never seem to bother him.
I love all of the moss and fungi out in the woods - in fact I've collected some and made terrariums with it. So far so good. We have a few trees with the entire trunk covered too and it's very cool.It looks like it could be saprophytic fungi growing up the side of the tree in bracts.

Are they dog-friendly?