The Royal Society for the Prevention of Cruelty to Animals said the Sittingbourne, England, woman, whose name was not released, came to the group for help when the animals' breeding got out of control and she was saddled with more than 100 guinea pigs, The Mirror reported Wednesday.
The RSPCA said it left the woman with four guinea pigs of the same sex.
"You couldn't fault the care. Some were living in very nice cages," the group said. "It just got out of hand. She was embarrassed."