Furry Babies pet shop in Joliet and the Fox Valley Mall in Aurora sell animals that are said to be worth thousands of dollars.
Aurora police said a 10-month-old Shih Tzu puppy, valued at $3,400, was reported missing by a staff member last Wednesday.
Police responded to the Aurora store just before 8 p.m., where they were told the brown and white puppy was stolen from its crate.
The missing dog is said to not be much bigger than the size of a hand and only weighs a few pounds.
The store, which has operated at the Fox Valley Mall for more than eight years, said this isn't the first time a dog has been stolen from that location.
The latest theft comes a week after a French Bulldog puppy was stolen from another Furry Babies store in Joliet. That incident was captured on surveillance video.
Police said the Joliet store's staff noticed the suspects looking at one of the puppies. The staff told police the suspects then abruptly left the store and they realized the puppy was missing a short time later.
Police said the video shows the men grab the puppy, with one of them hiding the dog in his coat.
Aurora and Joliet police detectives are currently investigating both incidents, and anyone with information is asked to give them a call.