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The life of a freight dog is worth less than the rest of us. Why else would we deny some dangerous goods cargo on passenger aircraft but allow the same DG on cargo aircraft?
Because in theory the CAO freight is accessible on the maindeck by the crew, so can be dealt with if there is a problem.
Whether or not this works in practice is quite another thing.
It is only accessible if a crew member is available to check it, which is doubtful in a full blown emergency with only two pilots on board.