airbiii make alot of strange noises on the ramp, dont ask me what they are tho, i can only assume hydraulic pumps and a/c packs.but as for the PTU ,totally normal yet unnerving sound! have also heard ptu operate on ground with both engines shut off.(thought it was unusual)
The "barking" sound was the clutches on the pumps. They make a rrr-rrr-rrr sound when the blue and yellow pumps are running. Both pumps have to be "on" to close the gear doors or move the flaps. The 'Bus makes plenty of noise, from it's packs, its pumps and the actuation of doors.
Passengers routinely tell the cabin crew about strange noises they have heard and we invariably find nothing out of order when we check.
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