Be careful how you carve the tree for a chair. There was a chair carved out of a tree for a local park outside sitting area. A man took his dogs, one large, one small, to the park one day and the larger dog jumped onto the chair, put his paws up on the back of it which unbalanced the chair, unfortunately the small dog got crushed and died when it fell over.
https://www.woodtv.com/video/grand-rapids-takes-action-after-structure-kills-dog-at-park/10607378/