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Chop is Lamar Davis's Rottweiler dog. In some missions, like the mission "Chop," players must play as Chop. Chop can sniff out quest items and people in these missions. Chop can also find Hidden Packages.
The companion app, IFruit, has a Chop care minigame. In this game you can earn points while feeding Chop to make him happy. This, in turn, will make Chop more effective in GTA 5. He will also stop doing 'his business' in Franklin's house.
To teach Chop some tricks do the following.