This dog is hard of hearing, but easy to love.

A deaf 4-year-old pit bull rescue named Blue has learned to “sit” and “come” just like any other pup — through specialized doggie-tailored sign language.

The light gray pup began three months of the unique training at the ASPCA’s CARE rehab center on Feb. 3, two days after cops discovered her chained to a fence, abandoned and freezing, on West 170th Street in Washington Heights.

As she was being treated for an infection, her handlers began to notice she was different.

“At first we thought she was just scared and confused,” said Victoria Wells, the senior manager of behavior at the ASPCA rescue center. “But then we noticed whenever someone opened Blue’s kennel, she’d sleep right through all the commotion.”

Wells snapped her fingers by Blue’s ears and dropped a heavy object behind her. She didn’t flinch.

“Any dog with a good sense of hearing would have been startled,” said Wells, who has trained over 100 deaf dogs. A vet confirmed the diagnosis.

It’s unclear what caused her handicap, but abuse has not been ruled out.

“There have been several cases here where head trauma caused deafness,” the specialist said.

Blue got right to work with seven behavior specialists, who hoped that their training would help “boost [her] chances of making connections with potential adopters and finding a safe, loving home,” said Joey Teixeira, the senior manager of the ASPCA’s Adoptions Center.

First, Blue learned the “thumbs-up” signal.

“It means they’ve done something right and we reward them with a treat as a marker,” Wells said.

Each time Blue followed a hand signal, she’d be given a thumbs-up.

Twenty-five other signals followed — “come,” a beckoning gesture with the palm turned up; “sit,” a scooping motion with the hand; “watch,” the OK gesture with the thumb and index finger drawing from the dog to trainer; “stay,” a stationary palm facing the dog, and “lie down,” a flat palm facing the ground while pushing down.

The most difficult task, Wells said, was getting Blue’s attention. Stomping works to send vibrations to the animal, but using food to attract them with smell — like Blue’s favorite, cheddar cheese — is most effective.

There is currently one other deaf dog at the ASCPA, and the rescue facility treats between 10 and 20 hard-of-hearing dogs per year, according to Wells.

Equipped with her new language, Blue is finally ready for a new home.

“Blue may not be able to hear, but she’s fluent in the language of cuddles, belly rubs and tasty treats.” Said Teixeira.