In October 2016, three dogs in Broward County, Florida, showed symptoms of overdose after they assisted in a federal drug raid . The dogs were more lethargic than usual, and they refused water. In West Virginia, the Monongalia County Sheriff’s Department has also become concerned about dogs used in drug raids. Al Kisner, the department’s chief deputy, told WVNews.com that they no longer take dogs off their leads in houses that might contain fentanyl, since the dogs could chew on an object covered in the potent opioid and inadvertently overdose.
Fentanyl is 30 to 50 times more potent than heroin—so deadly that just a few inhaled grains can cause an overdose. (A few human police officers have been hospitalized after accidentally inhaling puffs of the substance.) That can be a problem when sniffing is a police dog’s primary mode of detective work, the Atlantic reports.