He first appears in the episode 'A.R.F.' and was updated by Bob in 'Go Dog Go.' He always refers to himself in the third person in every episode with the exception of 'Go Dog Go' and 'How ARF Got His Voice Back.' (fully known as Auto-Doggy Robotic Friend voiced by Tom Kenny) - A robotic dog that Bob invented.

She and Cupcake are the only animals with unnatural fur color. In some episodes, she ends up going along with Bingo and Rolly on their missions.

Hissy (voiced by Jessica DiCicco) - A cynical purple tabby cat who cares for Bingo and Rolly like a big sister.

an 'inventor.' In the season 2 premiere 'A New Pup in Town,' Bob modified the fence between his and Chloe's house, so that Keia can play with Bingo, Rolly and Hissy and they can all visit each other's homes without having to dig under the fence and made a new collar for Keia (since her old one fell off), which she wears during missions with Bingo and Rolly. He works as an industrial designer/product designer a.k.a. Bob (voiced by Harland Williams) - The owner of Bingo, Rolly, Hissy, and A.R.F.Sam Lavagnino couldn't voice Rolly anymore after Season 3 due to puberty so Gracen Newton took on the role. Rolly loves to chew on everything he can find and it's a bad habit. He is Bingo's twin birthday brother but Bingo is older than Rolly. He isn't as smart as Bingo but is very silly. Rolly (voiced by Sam Lavagnino in Seasons 1-3 Gracen Newton in Season 4-present) - A fawn pug with a red collar with a gold bone on it.Issac Ryan Brown couldn't voice Bingo anymore after Season 3 due to puberty so Elisha Williams took on the role. Bingo is always ready to go on missions with his brother to help someone in need. Bingo (voiced by Issac Ryan Brown in Seasons 1-3 Elisha 'EJ' Williams in Season 4-present) - A blackish grayish pug with a blue lightning collar who is more mature than his twin brother Rolly.

They also have a kitty sister named Hissy and a robot dog named A.R.F. Puppy Dog Pals is about Bingo and Rolly, two pug puppy brothers who have fun traveling around their neighborhood and the world when their owner Bob leaves home.

Mii channel theme dog bark