Wild video shows a maniac flying into a rage when a French bulldog urinated on grass outside his home in Queens — stabbing two of his neighbors and even his own father on Thursday morning, cops and sources said.

The suspect, identified as Hakeem Alexander, 34, allegedly attacked the couple after he spotted their dog doing its business on a patch of grass close to the curb in front of his home in Laurelton, according to police and law enforcement sources.

Surveillance footage from around 11 a.m. shows the 39-year-old woman and her boyfriend, 39, with their pooch outside of their neighbors’ house on 229th Street, near 141st Avenue.

Two men run over after the pup pees — with the sick suspect even seemingly relieving himself on their lawn in an apparent act of retaliation, according to the disturbing footage.

The woman hits him in the back, which is when he begins throwing punches at the couple, leading to the knifings, the video shows.

The raging attacker cut the woman in her left hand and stabbed her boyfriend in the back, authorities said.

And when his 62-year-old dad tried to break up the melee, he too, was slashed in the left hand, cops and sources said.

All three were taken to Jamaica University Hospital Medical Center in stable condition.

Alexander was arrested and charged with three counts of assault, Channel 7 reported.

The attack came just weeks after 75-year-old grandmother Linda Scott was pummeled when she asked two women to pick up their dogs’ poop in Crown Heights – and the beatdown only ended when a Navy vet neighbor stepped in.