In Toy Story 4, the dog's name is Bitey White. He is a small, fluffy white dog who belongs to Gabby Gabby, the primary antagonist of the film. Bitey White is one of Gabby Gabby's henchmen, a group of ventriloquist dummies who assist her in her plans. Despite his somewhat intimidating role, Bitey White is more of a comedic character, adding a touch of humor to the story.

Bitey White's name is a playful nod to his role as a "biting" dog, though he doesn't actually bite anyone in the movie. Instead, he and the other dummies serve as Gabby Gabby's loyal followers, helping her in her quest to obtain a voice box from Forky, one of the main characters in the film.

The inclusion of Bitey White and the other dummies adds a layer of whimsy and tension to Toy Story 4, as they create obstacles for Woody, Buzz, and their friends. However, like many characters in the Toy Story universe, Bitey White ultimately contributes to the film's themes of friendship, redemption, and finding one's purpose.