5. Doberman pinscher
Due to an inborn fearlessness and deep stamina, the Doberman is one of the most popular breeds of guard dogs. Smart and assertive, they can easily be trained for dominance or docility.
Because of their past as war and police dogs, they may appear fearsome, but they are actually quite gentle. Their loyalty and acuity make Dobermans great additions to the family.
The average Doberman is about 26-inches high and 66 to 88 pounds, but the kennel clubs have dubbed some much larger Dobes “Warlock Dobermans.”
Next Up: Golden retriever