The monster who killed his ex-girlfriend’s Chihuahua in a fit of rage got a sweetheart deal Wednesday of just 60 days in jail for the gruesome pet killing.

Dog murderer Carlos Hernandez pleaded guilty last month to killing 3-year-old Honey, whom he grabbed from the arms of his ex, Karem Belalcazar, during an argument in January.

The brute, 33, then fatally slammed the petite pooch to the floor in their Forest Hills home.

Belalcazar’s 11-year-old daughter was home at the time, but did not witness the heinous act.

“I regret opening the doors of my house to a person who is so cruel and cold,” Belalcazar told the court Wednesday during a victim impact statement.

“Honey didn’t deserve to die this horrible way. She was adorable and was a big part of our family.”

Hernandez originally faced up to seven years’ jail time and had snubbed an offer of six months in prison.

But after pleading guilty to every charge in his indictment, negotiations were left up to Queens Supreme Court Justice Deborah Stevens Modica and his defense attorney, law enforcement sources said.

Modica made good on the promised wrist slap Wednesday when she sentenced the killer to 60 days and four years’ probation.

Hernandez also must register with the Health Department as an animal abuser, which will block him from buying or adopting at city pet shops and shelters.

Hernandez’s attorney did not return a request for comment.