Dogs are awesome. They were the first species to be domesticated. 
They are awesome! I find it amazing how many species are in existence.
There are so many because they have been selectively bred over thousands of years for various behaviors and physical attributes
This is true, I personally prefer bulldogs. Did you know the American Bulldog was bred to hunt boar?
Interesting, I did not know that. Dogs perform lots of roles for people, such as hunting, herding, protection, and companionship 
Yes, they do. Some are smarter than others. Like the Boarder Collie, they are the smartest dog breed.
Border collies are so cute! I like German Shepherds. They are common in assisting police and military
They are very cute! I used to have a German Shepherd when I was young. She was the best!
to 1899. As part of the Herding Group, German Shepherds are working dogs developed originally for herding sheep. Since that time however, because of their strength, intelligence, trainability, and obedience, German Shepherds around the world are often the preferred breed for many types of work, including disability assistance, search-and-rescue, police and military roles, and acting. The German Shepherd is the second-most registered breed by the American Kennel Club and seventh-most registered breed by The Kennel Club in the United
was the first species to be domesticated and has been selectively bred over millennia for various behaviors, sensory capabilities, and physical attributes.
Their long association with humans has led dogs to be uniquely attuned to human behavior and they are able to thrive on a starch-rich diet that would be inadequate for other canid species. Dogs vary widely in shape, size and colors. They perform many roles for humans, such as hunting, herding, pulling loads, protection, assisting police and military, companionship and, more recently