Argonaut is the Wilsons' robotic talking dog. Rebecca and Cecil were unaware of his robotic nature until their house came under attack. Prior to this revelation, Argonaut didn't bark and rarely ate, simply looking at Cecil when he threw food at him.
He has long mechinal arms, oil spill, metal poop bombs, and has two modes: sentry or attack. Argonaut eats metal and even ate Rebecca's science project. It seems, he went to a academy with other robot dogs.