what are the best guard dogs?
[' of 15. Doberman Pinscher. ... ', ' of 15. Estrela Mountain Dogs. ... ', ' of 15. German Shepherd. ... ', ' of 15. Giant Schnauzer. ... ', ' of 15. Puli. ... ', ' of 15. Romanian Mioritic Shepherd Dog. ... ', ' of 15. Rottweiler. ... ', ' of 15.']