Pups as Drug Smuggling Mules.

Tired of using humans as mules, drug smugglers now use labrador retrievers:

In the case of the puppies found during the 2005 raid, the dogs’ bellies had been cut open, and heroin packets were stitched into their stomachs, Payne said. The pups, mostly purebred Labrador retrievers, were sewn back up and prepared for shipment to the United States, he added.

Link