A tiny-armed T. rex never stood a chance against the long arm of the law.

Police dashcam footage shows British cops laughing hysterically as they chase someone dressed as the famed dinosaur.

“He’s pretty quick!” one of the officers in Plymouth notes as they drive after the dashing dino, with another quipping, “He is — you wonder how they became extinct, don’t you.”

The Charles Cross Neighbourhood Police Team did not say why the dinosaur — who stops running at the end of the clip — seemed to be fleeing police on Saturday night, or how it ended.

But the officers were happy to share the hilarity as they tweeted out the video clip, saying, “Just another late shift in Plymouth.”

“We can confirm the Doyouthinkhesawus is NOT extinct and they can run real fast!” the force said, with many followers taking up the challenge to share dino jokes.

“I recognise him. It’s Terry Dactyl,” one, Su Carroll, tweeted in reply.