He's one of Jeremy's new coworkers, and another member of the Lacon Construction crew.

They're mainly dogs, and they're basically all... like that. Except for Jeremy. He's not a dog and he's not... like that.

It doesn't necessarily mean anything. It's possible that Chuck isn't even consciously aware that he needed to start diversifying his talent pool, or that he's already done so. Mentally he classifies Jeremy as some sort of Wiggly Riverdog.

It's not out of the question that Chuck has met Sully, who falls under the category of Smelly Bouncehound.

Character adopt from  BearlyFeline

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(I still think there's a hyena on the team: namely this one.

Yes, he's also in the Paleolithic cast. He has a Unique Time Phenomenon going on with him, too, although his is a more relaxing experience than what Victor's going through.

You see, whenever Smepaldi falls asleep he dreams he's a construction worker in the modern day. And whenever the construction worker goes to sleep he dreams he's a hunter-scavenger in the ancient world. It's been going on like this for quite some time now.

No explanation presents itself. Nobody ever learns anything more about it. Emmet never gets the chance to analyze him, or ponder whether he can use the hyena's dreams to send messages back to Dagskwerhe.

Eventually one of the two will die, and then who can say what will happen. Whatever the case, an ancient story about butterflies comes to mind.)