The family of a puppy killed during a United Airlines flight last week joined Sen. Marisol Alcantara Sunday as she announced a new Passenger Bill of Rights — for pets.

“Make no bones about it, United is in the doghouse,” the Manhattan state senator said from LaGuardia Airport, where she announced “Kokito’s Law.”

Alcantara addressed the protesters who attended the “dog-in” flanked by her own rescue pooches, Tweete and Sylvester.

“I feel devastated,” the puppy’s owner, Sophia Ceballos, said tearfully Sunday. “Every night I cry because it feels really empty without him in the house. He was really special. And I just think about him every day at school and I can’t concentrate.”

Ten-month-old Kokito was killed last week during a United Airlines flight from Houston to New York, when despite the family’s protestations, a careless flight attendant shoved his air-travel approved carrier into an overhead bin.

The family heard the tiny French bulldog whimper and bark mid-flight, but were prevented from getting up to help him due to turbulence.

They unzipped his carrier after landing, only to discover their beloved “Little Pig” was dead.

The negligent attendant later said she didn’t realize there was a dog in the bag.

Alcantara insisted her bill was headed for the floor of the state senate. Should it pass, Kokito’s Law would bar pets from being placed in overhead bins, ensure pet passengers have the same rights as human passengers, demand that cargo areas are pressurized, ventilated, and climate controlled, and hold airlines to a number of other basic safety standards.

United Airlines — which last year had the highest rate of animal deaths per airline carrier, with 18 animals killed and 13 injured — has taken full responsibility or Kokito’s death, and is investigating.

“There needs to be accountability. Although United did, in fact, accept responsibility, they have yet to tell us the name of the flight attendant or provide any information as far as what’s going to happen with this flight attendant,” the family’s attorney, Evan Oshan, said. “We want justice. We want criminal prosecution and we want the right thing to be done.”

The Queens DA’s office has said it is investigating the pooch’s death. The attendant later said she didn’t realize there was a dog in the carrier.