A whacked-out Williamsburg woman throwing bottles out her window shifted her violent rage to her helpless dog — body-slamming it onto the pavement in front of her home, sources said yesterday.

Alexandra Mendez-Diaz, 30, slammed the pooch to the ground at North Seventh Street and Driggs Avenue at 9:30 p.m. Wednesday, authorities said.

“Crazy insane bitch slammed her tiny little dog on the ground,” one witness posted on Twitter. “Crying my eyes out.”

Mendez-Diaz was charged with animal torture and marijuana possession.