Chop is the name of Lamar's Rottweiler dog in Grand Theft Auto 5. Lamar is good friends with Franklin (one of the main protagonists) and from all the news, information (and leaks) to date it seems that Chop will spend a large amount of time with Franklin. We also know for sure that you'll be able to control Chop with the following command list having made it's way onto the internet:

Xbox 360/Xbox One PS3/PS4 PC Command RB R2 Left mouse button Walk or dismiss Chop D-pad left D-pad left Whistle to make Chop return to Franklin RT R1 [Spacebar] Make Chop hunt for collectibles X O Q Make Chop sit B Square R Make Chop give paw A X E Make Chop beg Y Triangle Pet Chop

And the Chop artwork pinned to the top of this post is new too. We hope to have all the cheat codes for GTA 5 for you shortly!