Royal Mail suspends deliveries to estate - because of one dog

An entire estate in Salford has had its postal deliveries suspended because of one dog. After an incident with two postmen, during which a post bag was damaged, the Royal Mail wrote to residents telling them they'd have to pick their own post up for a while because it was too dangerous for postal deliveries to be made in the estate.

So what's the issue, and can the Royal Mail do this?
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