Hopefully you prepped for the SECONDARY reason that dogs scratch at the thresholds of doors…termites. The work of termites is clearly apparent to dog hearing and the little scritchy scritch scritch of their movement and mandibular naughtiness at the expense of our home irritates their ears. They hear it…but don’t see it…and so, like going after the gopher that ducks under the lawn, your dog tears into the wood to get at the invisible enemy within. Any time you tear out wood that has dry rot or any other defect you should prep the area with a long lasting ‘oily’ pesticide specifically for termites. I do want to compliment you on a BEAUTIFUL JOB! And absolutely splendid taste in finish! One of the more serious faux pas in woodwork that Americans and Western Europeans have adopted unnecessarily from the East and far North is the brightly painted accents of trim, doors and eaves! In places that paint is the last final solution to resist weathering I say ‘great!’ Pour it on! But where we can it is so important to restore the beauty of natural wood finish and earth tones to our environment. This is how woodwork has been done for two thousand years in warmer and gentler climates simply for the beauty of it. Forgive me for the length here but I almost exclusively restore woodwork, buildings and furniture from the 14th-17th C and am always pleased to see the natural beauty of a thing be brought out in the practical usage of a thing. The right wood, the right finish…You’re a boss woodworker!