A Brooklyn tattoo artist bragged about inking his dog with a heart and his wife’s name while the poor pup was drugged after surgery — and animal lovers are barking mad.

Tattoo master “Mistah Metro” declared, “My dog is cooler than yours!” in an Instagram post Wednesday that revealed a photo of what appeared to be his zonked-out pooch sporting the romantic tattoo.

“She had her spleen removed yesterday, and the vet let me tattoo her while she was under,” he said.

The tattoo shows the image of a red heart impaled with an arrow, Cupid-style, with the first name of the inker, Alex, and his wife, Mel, a friend of the artist told The Post.

It was created in a shaven area on the shoulder of the pit-bull mix, whose name is Zion.

Soon after the pic went viral, dog lovers frothed at the mouth.

“That is disgusting. how could you do that to a poor dog?” Twitter user @JordanBurmeis raged.

User @arodomus added: “Unfortunate the dog can’t talk. He’d have a few choice words!”

Others fired off slams such as “You make me absolutely sick” and “I hope you rot in jail!”

Chris Torres — the owner of the Red Legged Devil tattoo shop in Prospect Heights, where Mistah Metro works — said he had nothing to do with the tasteless tat.

“It wasn’t done at my shop. I’m an animal lover,” said Torres, who has appeared on the TLC reality show “NY Ink.”

Animal-rights advocates also criticized the tattoo, saying canines should be inked only for ID purposes.

“The tattooing of an animal for the selfish joy and entertainment of its owner, without any regard for the well-being of the animal, is not something the ASPCA supports,” a spokeswoman for the organization said.

Veterinarians sometimes tag dogs with small tatoos after operations — but vanity tattoos are not the same, she said.

“It helps animal-welfare professionals clearly identify animals that have been altered . . . The incident in question is not at all comparable, ” she said.

Mistah Metro, who also goes by the moniker Orangutan Joe, quickly disabled his social-media accounts after the controversy erupted Wednesday.

He didn’t return several requests for comment.

A pal, Jack Rodado, said the artist wouldn’t mean to hurt the dog.

“Metro is a very cool, nice, mellow, laid-back guy,” Rodado said.

“I don’t think he tried to hurt the dog on purpose. But tattooing a dog? That’s kind of a bad call.”