9. Chop
One of the very first missions in the game has Franklin teaming up with buddy Lamar (who I'll get to in a moment) to chase down a perp and ransom him, and the task is aided by the use of Lamar's pet dog, Chop, introducing a whole new dimension to the GTA franchise. We don't just use Chop to chase the guy down, but we can even character switch to his first-person-perspective as he sniffs the guy out, most hilariously when Chop ends up cavorting with another dog (who in fact happens to be male). Chop is one of the many fun diversions that GTA V has to offer; for instance, you can take out a ball and play catch with him, which has no doubt prompted many of us to hurl the ball off a cliff (I recommend Mount Chiliad) and watch the hilarious(ly awful) results with demented glee. When we get fed up of nurturing relationships with Franklin's lady-friends and just want some peace, Chop is the ultimate companion.