Go for German Shepherd or Labrador.

Golden retriever or labrador. they are both easily trainable.

The Doberman Pinscher (alternatively spelled Dobermann in many countries) or Doberman is a breed of domestic dog. Doberman Pinschers are among the most common of pet breeds, and the breed is well known as an intelligent, alert, and loyal companion dog. Although once commonly used as guard dogs, watch dogs, or police dogs, this is less common today. In many countries, Doberman Pinschers are one of the most recognizable breeds, in part because of their actual roles in society, and in part because of media stereotyping (see temperament). Careful breeding has improved the disposition of this breed, and the modern Doberman Pinscher is an energetic and lively breed ideally suited for companionship and family life.

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The Labrador Retriever ("Labrador" or "Lab" for short), is one of several kinds of retriever, and is the most popular breed of dog (by registered ownership) in both the United States and the United Kingdom. The breed is exceptionally friendly, intelligent, energetic and goo ...more

Y donnot u go for same breed itself or even lab is good