Unmasked (1917/2014)

Directed by Grace Cunard and Francis Ford

IMDb
Wikipedia

Unmasked was released as a bonus feature on the Alpha Video DVD His Master’s Voice, which is also available as part of a 4-DVD bundle called Wonder Dogs of the Silent Screen.

Purchase His Master’s Voice from oldies.com
Purchase Wonder Dogs of the Silent Screen from Amazon
Purchase Wonder Dogs of the Silent Screen from oldies.com