I live in a 10 year old house with an exterior door frame that has dry rot at the base of the frame. We recently had our house painted and the contractor just painted over the frame and didn't notice the issue. Somehow, our new puppy started chewing on the door frame and was able to dig a huge chunk out of the frame.

I started investigating and saw that a huge portion of the lower frame had dry rot. My question is can it be repaired and how or should I replace the entire door/door frame?