COLUMBIA, S.C. — The death of a police dog left in his handler’s car in South Carolina is a reminder that hot cars can be as dangerous for the animals as chasing criminals. At least three police dogs have died from heat stress inside vehicles so far in 2018 and that number is unofficial, because there is no requirement to report the deaths of police dogs to the government, said Catie Cryar, a spokeswoman for People for the Ethical Treatment of Animals. The Officer Down Memorial Page lists three police dogs killed by gunfire this year. Last year PETA counted 13 police dog heat deaths, Cryar said, while the website had seven dogs killed by gunfire and two stabbed to death. “We appreciate these dogs and we need to make sure our actions show it,” said James Hatch, who founded a group to protect police and military dogs after a K-9 saved his life during his last deployment as a Navy Seal. Hatch’s Spikes K9 Fund raises money for body armor to protect dogs, but also for heat alarms that start by sounding a horn and alerting a handler’s cellphone when temperatures in a vehicle get dangerous for a dog and continue to escalate until eventually popping open the door so the dog can get out. “Turbo,” a Labrador mix owned by the Columbia Police Department, died in July after being left in a vehicle for more than six hours as his handler was at active shooter training at a high school.