The audience's 'Dog Boat' is the Fairmile D motor torpedo boat. Its armament included four 18-inch torpedo tubes, two power-operated six-pounders, twin 20-millimeter Oerlikons, and additional machine guns. That combination made the craft dangerous to opponents far larger than itself. Pound for pound it could attack almost anything, but it might not survive the encounter. Coastal forces traded severe vulnerability for speed and concentrated offensive power.
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Fairmile D 'Dog Boat' firepower in a small hull
A quick technical appreciation inventories the Fairmile D's torpedoes and guns to show how much offensive power coastal forces packed into a vulnerable craft.