Here I'm sitting just thinking away, this animal emerges and startles me đ Think it's an otter? 
Discussion
Looks like a beaver. đĻĢ
Not with that tail.
Also, their fur isn't near as waterproof, but no one would know until making one into a hat. In the olden days, Nutria were used as a poor man's replacement for beaver.
It's a Nutria
River rat