I've got a lot of respect for police dogs, they do a good job in difficult circumstances, and the vast majority are hard working and decent. So for two of them do die an agonising death of heat-stroke and dehydration is pretty grim.
I'm not even going to use this as an opportunity to slag off the police, but I hope the officer(s) involved are done for animal cruelty.
As an asside, legal minds, what would the courts dole out if the police brought them someone they'd arrested for smashing a car window to allow a dying dog to get some air? What about if it was a baby left inside a car?
Stay cool.