A man's best friend is undoubtably his dog. They're friendly, loyal, quirky, and great to talk to. A great friend, one who will never judge your wardrobe or what you said or did today. When you come home, all they want from you is a hello and a petting. They'll never refuse attention, or a treat (or several). They'll love you simply for being there and loving them back.
My dog Biscuit is a great dog. Truly man's best friend.
Happens when you and your wife/girlfriend want to have a threesome. Instead of having another human, you add your dog to enjoy in oral sex or Anal licking in a "Human Centipede" position with the dog in the middle. This is known as "Man's Best Friend"
I asked my gurl what she wanted to do tonight, so i called in my Hound and did Man's Best Friend!