You are right. Mother dog was minding her own business in fenced in property. The dog next door somehow got to her. Won't happen again. She has an appointment to be spayed as soon as the puppies are weaned. Don't know her history, except that she was left chained to the side of the house when her owner moved out. She spent her life chained up. She is now a working dog guarding fenced commercial property that she has free run on. She also went on long runs in the country with her new "Dad" before motherhood.