Questions on ill dogwood & boxwoods...

Two small boxwoods suffered in last year's drought. They had some golden areas that are green again but also have about one small, bare section each. Should I just throw them out or will they ever fill in again?
I just noticed one very old, lovely, but not too big dogwood has some bare branches at the very top. Is is on it's way out or fixable? Should I just cut it now or wait to see what happens in the spring?
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