I'd think it was a joke that cops just show up and shoot your dog if you call them. But my best friend in highschool called the cops on his uncle when he was on drugs and became violent. First thing they did after they showed up? I shit you not, they shot his dog. It lost a leg, but thankfully didn't die.
Before reddit went to shit there was a sub called "puppycide" dedicated to all the dogs the police were killing. It was staggering the amount of new content that sub got on a regular basis. It's not just a meme. Cops shoot a lot of dogs. Like every day.
The DOJ estimates that around 25 to 30 dogs are killed by cops every day, with some numbers as high as 10,000 per year. The totals could, in fact, be higher, since most police agencies do not formally track officer-involved shootings involving animals.