When does a Bullmastiff typically bark once it has engaged a trespasser?

Answer

Once they have secured the subject to alert the owner that action has been taken

The operational requirement favored silence until confrontation; they often only bark once they have secured the subject to signal to the owner that they have taken action.

When does a Bullmastiff typically bark once it has engaged a trespasser?

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How Much Do BULLMASTIFF BARK? - YouTube

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