A 96-year-old New Jersey granny is heartbroken after a coyote attacked and killed her “best friend” — her pet Chihuahua, Hartman.

Doris Heitman let the small dog out on a leash Tuesday night in the back yard of her Wyckoff retirement community — which borders a wooded area — when the coyote suddenly snatched the pooch.

“I looked up and I see this looked like a … shepherd dog running in the woods,” Heitman, who heard Hartman yelp as he was grabbed, told WABC.

The coyote ran off with the dog, which was found dead a half-mile away by Heitman’s grandson, Brian Heitman.

“Hartman is a part of my family like any dog is to any family and I just felt like I couldn’t leave him out there, so I grabbed a kitchen knife and I just ran in that direction,” Brian told the news outlet.

Brian found the lifeless pooch near the killer coyote.

“He kept continuing to circle me trying to protect its prey, I guess,” said Brian of the coyote.

Doris, a grandmother of four, says she is “not functioning really well” after the fatal attack.

“I just keep going over my puppy loss and how it happened,” she said. “I couldn’t sleep, kept seeing that critter in the woods.”

Speaking of Hartman, Doris tearfully told the news outlet: “He was my best friend. He was my comforter. He was a companion. We were growing old together … He was a blessing to me. I loved him very much.”

The Wyckoff Police Department said it responded to the incident and immediately contacted Tyco Animal Control.

“Tyco monitored the situation and is investigating,” the department said.

Two days before the dog attack, the department posted a warning to residents on Facebook, saying that it had received “numerous calls lately about wild animals roaming in town, especially foxes and coyotes.”

“These animals are found naturally in Wyckoff and are actually quite abundant,” police wrote. “At this time of year, adult animals are trying to keep their new offspring fed properly and will be active most hours of the day to accomplish this.”

The department asked the public to notify it “if an animal is acting aggressively or threatening.”