The dog was actually the first species that was domesticated. That's a good thing because they are such great companions!
They are great companions I have 2 myself I love them. 
Yes, me too. Since they have been domesticated for so long, they have adapted many human behaviors, such as a diet with much starch, which other canid species couldn't eat.
It is so crazy how they can be trained to listen and do things they are smart animals like the K9 dogs are so smart.
It is. From hunting, herding, assisting police, protection and companionship, they are wonderful buddies for us!
I forgot about the hunting part they are defiantly great in that aspect as well they are great friends to have especially ones that grow up with the family.
I know! I can see exactly why they are nicknamed "man's (woman's) best friend". They are so loyal and even family to many people.