The Brooklyn father whose 19-month-old son was mauled to death by the family’s Rottweiler was arrested Wednesday and charged with criminally negligent homicide, police said.

Vernon Foster, 30, was also charged with manslaughter and acting in a manner injurious to a child.

Authorities say the toddler, Ryan, was attacked by the dog at around 10:45 p.m. Tuesday inside an apartment on East 17th Street in Flatbush. Investigators believe Foster had left the child alone with two older brothers, 11-year-old Jayden and 9-year-old Tale’, to go to work.

The Rottweiler, named Buster, left Ryan bleeding heavily from bite wounds to his neck and shoulder, police said. The boy was pronounced dead at Maimonides Hospital.

Video obtained by The Post shows the two older siblings running from the apartment building and frantically asking passersby for help. Their mother, Susan Hyre — who is separated from Foster — said the brothers have been traumatized by their younger sibling’s death.

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