Grand Theft Auto VI's trailer debuted on Netflix and confirmed players can interact with dogs. Jason and Lucia encounter one in an apartment hallway with options to pet scold or study it. A New York Times report noted that treats can be bought at shops.
Trailer Interaction Details
According to GameSpot the sequence reveals three choices when approaching the dog with scolding and study noted as additional mechanics possibly tied to behavior or animal study systems from Red Dead Redemption 2.
Source
GameSpotView Original Article