Answer: Pyracantha is iffy in Washington, but Cotoneaster will grow well in full sunshine. You might also consider Escallonia, which is a fast-growing evergreen with summer flowers. Whatever you decide to plant, keep it at least 3' away from the fence. By the time it grows to the fence line the plants will be established enough to tolerate some grazing.
Cotoneaster grows 8-12' tall and wide so you'll want at least 20 plants for your 200' fence line to provide a thick privacy screen. Escallonia grows about 6' tall and wide so you'll need about 30 plants.
Best wishes with your new shrubs.
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