It’s in the nature of canines to form “packs“—it’s part of their nature. If you only have one dog at home, this behavior isn’t noticeable for the simple reason that there aren’t any other dogs for you to compare their “ranking” (although dogs are known to make their human family their “pack”).
Since we have 13 dogs, it’s easy to see how the ranking in our pets’ pack is. Spike, being our eldest dog, is the alpha male. The alpha female is Tootie. Recently, Choknat has been showing some signs of becoming the next alpha male due to Spike’s old age.
But the most amusing thing about our dog pack are the little “communities” they have within their community. Each member of our family (me, my dad, my mom, and my sister), have about three favorite dogs each. And with this, they form their own little communities and establish their territories depending on where me and my family like to hang out. Sheero, Choknat and Harry will fight tooth and nail to protect “their” computer room.
This “pack mentality” is actually what some dog trainers take advantage of in order to have the dogs follow their commands. I’ve been practicing that a bit, but I might have to work on it more—Sheero is still being a difficult spoiled brat. 
