Porch/Deck Sealer

I moved to a new house this summer that has a screened porch w/pressure treated wood floor decking. I stripped and treated the floor with a quality wood deck sealer treatment. However, over the last three months my dogs have torn up the new finish on the floor in places with their nails. I was wondering if there was a better, longer lasting solution, perhaps a polyurathane floor finish. Would that would be an option on a small porch exposed to the elements and ultraviolet light. The wood sealer just does not seem to be holding up to Labrador Retrievers. Jim
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Trim and file their nails, they will ruin any finish.
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