A Brooklyn man wants to sic the courts on his ex to keep her from taking their precious Pomeranian to New Jersey.

James Alexander wants at least $50,000 in damages from former girlfriend Monica Lakhaney, whom he says agreed to joint custody of their pooch, Teddy, on alternating months.

The pair adopted the pup in October 2018, said Alexander, 33, in a Manhattan Supreme Court lawsuit he filed this week against Lakhaney, 33.

They paid $750 for the 10-pound pooch, but the Williamsburg man, who works in finance, said in court papers that he “overwhelmingly took [on] the burden of caring for Teddy’s medical, mental, social, and financial needs.”

The couple broke up in August 2021, deciding to share Teddy, who spent one month with Alexander before spending the next with Lakhaney, of Murray Hill in Manhattan.

The arrangement was fine until Sept. 17, when Lakhaney allegedly told Alexander “she was unilaterally ending the agreement, and that she was moving to New Jersey,” he said in legal papers.

Lakhaney has refused to return Teddy to Alexander, he contends, and he is asking a court to force her to return the dog.

“He very much loves his dog, Teddy,” said Alexander’s lawyer, Victor Feraru, who added he believed Lakhaney “is being spiteful.

“Dogs are members of our family, and a member of my client’s family was taken away from him, unilaterally,” he said. “Thankfully my client can turn to the court for protection from such a vindictive act.”

Lakhaney declined to comment.