Six puppies were revived and treated by first responders and are now being monitored at a local animal shelter

Six puppies in rural Washington state will soon be up for adoption after being revived after a suspected drug overdose – and some of them might go home with the fire-station staff who saved them.

Two people dropped off three of the sickened puppies at Sky Valley Fire, about an hour’s drive north-east of Seattle, on Sunday. Officials believe the animals either breathed or ate fentanyl.

Firefighters sprayed the anti-overdose medication naloxone up their noses, and also treated them with oxygen and even performed CPR. It wasn’t long before their tails started wagging, Brandon Vargas, the battalion chief, said Tuesday.

Meanwhile, sheriff’s deputies tracked down the people believed to have dropped off the dogs and found three more puppies that also needed treatment. An animal cruelty or neglect investigation is under way. The pair claimed they were caring for the puppies temporarily, authorities said.