Mess with the bull, you get the cuffs.

Dozens of protesters were arrested Monday morning for dousing lower Manhattan’s “Charging Bull” statue with fake blood as part of a climate-change demonstration.

Members of the Extinction Rebellion group scaled the bronze bovine at around 11 a.m., waved a green flag bearing the eco organization’s symbol, then splashed the statue with the faux gore.

The British-born group also protested in Paris, Berlin, London and other cities around the globe on Monday.

Extinction Rebellion has blamed methane-filled cow farts for contributing to global warming, but organizers with the New York chapter said on Monday that the bull was in their crosshairs because it’s a symbol of capitalism.

“Throwing blood on the bull is tying climate change directly back to the financial industry, which is financing fossil-fuel infrastructure,” said Christine See, 35.

After goring the bull, the protesters staged a “die-in” at the Broadway statue, splaying themselves out at its hooves.

But like good anti-pollution activists, they cleaned up their own mess, using mops they had brought along to soak up the fake blood dripping down on the statue and between the cobblestones below.

“We’re not here to destroy things,” See explained.

Still, the cops moved in, cuffing dozens.

The NYPD confirmed 90 arrests for civil disobedience.

See said roughly 30 people were busted on the contingent’s march toward Washington Square Park, which they plan to use as a base for a series of protests through the week.

By midday Monday, the park had taken on a carnival atmosphere, with booths being set up for food, music performances and puppet shows, as well as information on climate change.

But the message was muddled for some passersby.

“It was more show than anything else,” said Britt Ottlen, a Dutch tourist who witnessed the bull dousing. “I think they could have made their point in a much better way. I’m just not sure what they wanted.”

A moderate police presence kept watch from the outskirts at Washington Square Park on Monday.

Additional reporting by Craig McCarthy