Check out Antediluvia on Fa to figure out ( https://www.furaffinity.net/user/antediluvia/ ), together with a couple of other otter antics! A big thank you to him since he is the one who commissioned this particular piece :)
Character obviously belongs to him as well
Link
DOPR
Maybe it's the birches, but this has a very Bill Watterson feel to me. Very nice.