Why is that the case you may ask? Well, according to actress Melanie Zanetti, who voices Bluey's mum Chilli, it's all to protect the children who work on the series.
"All the children on the show are members of the family of people in production. I am so glad that the creatives on the show decided that no one would be in the credits to protect the young cast," Melanie told Kidspot.
She also expressed how grateful she is to the creative team for "being so wise in that area" and protecting their young cast.
"I think that was so clever and I'm so happy that, not knowing how big the show would be, they had the foresight to do it. In the long term, I think that protecting young people is so important in this industry."
While the voices behind the younger characters can't be revealed, we do know who joins Melanie on the credits list, and that is Dave McCormack, who voices Bluey's dad Bandit.
Also among the cast are Myf Warhurst as Aunt Trixie, Megan Washington as teacher Calypso, Layne Beachley as a surfer, and Dan Brumm as Uncle Stripe, who all make regular guest appearances.
Blue Wiggle Anthony Field also made a guest appearance in the second season, where he played a post office employee.
As for what it's like being one of the voices behind these beloved characters, Melanie said fans rarely recognise her voice from the show.
"I kind of love that. I have a bit of a chameleon voice," she said. "With Chilli, I lean more into Australian dog mum with cute little puppies."
"I think it's less recognisable but I've been in a number of situations in America, which is wild, where people lose their mind when they find out," she added.