4. German Shepherd 

A well-known fact about German Shepherds is that they are very devoted to their families. This dog would guard not just its immediate owner, but also the rest of their family. German Shepherds are excellent guard dogs due to their strong sense of devotion, but they need proper socialization and training to prevent them from being overly protective. The good news is that this canine is intelligent and obedient, therefore they are effortlessly trained. 

One of the reasons German Shepherds are so popular is their adaptability to any lifestyle or living circumstance. German Shepherds prefer homes with a wide yard, but they may quickly adjust to apartment living as long as they receive enough exercise.