Are newfoundland good guard dogs? Asked By: Claudie Hintz. Date created: Thu, Jan 7, 2021 12:17 PM. Best answers. Newfoundlands are ideal companions in the world of therapy and are often referred to as the nanny dog. The breed was memorialized in "Nana", the beloved guardian dog in J.M. Barrie's Peter Pan. The Newfoundland, in general, is good with other animals, but its size can cause problems if it is not trained. Answered By: Herminio Reilly. Date created: Fri, Jan 8, 2021 2:20 PM. FAQ ...