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Dogs are never featured in any of the GTA III era video games. but they are mentioned several times by in-game characters.
A dog by the name of Hugo is mentioned on Chatterbox FM in GTA III. The dog is owned by Jane and Sam.
Dogs have been rumored to appear in GTA IV. The sound of dogs barking is a scripted ambiance noise in GTA IV, but they can never be seen. Dogs are only mentioned by in-game characters, like Hossan, who has said that he will get a dog, and Alex Chilton saying she owns a chihuahua named Valentino.
In GTA V, there are 15 different breeds of dogs, ranging from Rottweilers to Golden Retrievers. Dogs are usually seen being walked by their owner. Other times, dogs tend to spawn next to a house, while their owner sits nearby watching.
All dogs are known to attack the player if they are physically provoked. Sometimes, dogs may attack the player unprovoked, for no reason at all.
In the mission Risk Assessment, Franklin comes across a barking dog in Vinewood Hills. Franklin follows the dog along a dirt path to where Dom Beasley is found hanging by the lines of his parachute in a tree, appearing to have gotten stuck there from a previous jump. After helping Dom get himself loose, the dog disappears without an explanation, but then appears in the mission Uncalculated Risk, where under similar circumstances, Franklin finds the dog barking, this time near the Land Act Dam. The dog leads him to the edge of the dam, where Dom can be found preparing to jump off of the dam without a parachute. Dom then jumps off of the edge of the dam and dies on impact with the ground, and the dog disappears once again. Strangely, no explanation is given for the dog or its abilities, leading players to form their own conclusions about its nature. The dog's fate remains ambiguous for the rest of the game.
- The sound of dogs barking is scripted as an ambiance noise in GTA IV but they can never be seen.
- Dogs were to appear in GTA San Andreas but were cut. This can be seen in the game's files.
- Katt Williams points out that he's never seen a cat or dog in Liberty City, when doing one of his stand up comedy acts.
- In GTA V, if the player is to attack the owner of a dog the dog will come to the aid of the owner by attacking the player.