1. Doberman Pinscher
These dogs are known to be intelligent, naturally assertive, and fearless. They are known to have been on the frontline in different wars according to history and are great at doing various police jobs too. Their training often involves showing them how to be more docile and even though they look fearsome and aggressive, they are very gentle and affectionate. These dogs are also very loyal making them great for your family setup. There you go. Fifteen different dogs are known to be very smart. They will make a great addition to your family or workplace as they are all great at carrying out different tasks.