I read this book with my dad 15 or so years ago, when I was quite young, and I haven’t been able to track it down since. It is about a young mouse who is extremely slow at everything, and one day his parents and many siblings go out on rollerskates (not 100% sure about the rollerskating part) and because he is so laggy, he is left behind. He ventures into the wilderness and settles by what I remember to be a lake, where he begins building a house out of sticks and leaves and eventually makes friends. I think he is reunited with his family at the end. If it helps, the fabric book cover was a dark reddish color with a small, realistic drawing of a mouse standing on its hind legs in the center. It was very weathered over a decade ago, so it may be a much older book. Thank you!!