"There's nothing scarier than walking down the street at night, minding your own business, and have a large dog come racing up to you and barking in your face. "

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Being bitten by said dog is scarier.

People racing up to you carrying torches and pitchforks or guns is
scarier.

Watching a troop of soldiers marching up a street with machine guns at
the ready position when there is no parade going on can give one the
willies.

Howie52
Free running dogs - particularly in a pack - can be intimidating.