Footage from CCTV shows the coyote grabbing the terrier by the neck and dragging her around the yard.
The Massachusetts family found the animal wandering alone and distressed along a busy road.
Although coyotes are usually wary of humans, one coyote has reportedly injured three Marines and one sailor along a popular jogging path.
The woman walked nearly two miles after being bitten in order to get to her car, before driving herself to a hospital.
The boy was bitten multiple times outside the Peggy Notebaert Nature Museum in Lincoln Park, police said, hours before a 32-year-old man walked into a hospital saying a coyote had bitten him.
Coyotes in your city don't want to kill you, but they might try to eat your cat or small dog.
A hybridized canid made up of coyote, wolf and dog genes is expanding across the eastern U.S.