Earlier Sunday, at a pet shop in St. Louis, a man dropped off a kennel with the three puppies and walked out.
A veterinarian looked at the dogs and says they are in great health.
Last week, two puppies were stolen from two pet stores in Naperville and Bolingbrook.
Days earlier, a puppy was stolen from a pet shop in St. Louis.
Police believe the thefts are related and are looking at surveillance video.