Been in the same situation. My dog had a bowl of water with ice cubesin it. This lady came in the store ranting & raving. Ended up having to have the manager call the cops to get to quit harassing me.

Then again I worked security loss prevention for a grocery store. This lady came up to me and told me there was a dog in a car ready to die. Went out & found a Chihuahua sitting in a car windows up in 100 degree weather, looking almost dead. Called the cop. He couldn't break the window due to department regs, but he'd stand by if I wanted to. Long story short got the dog out & cooled down enough to get him to a vet. The Hispanic lady that owned the car didn't give a crap about her dog only asked about her window. The cop stepped up & told the piece of crap that if she wanted to file a report on me, he'd have to take her to jail for animal cruelty & abuse & she might get deported if she didn't have a green card. She hopped in the car drove off without the dog. Glad to say the dog has a nice home with people that do give a crap.

BTW, You can pop a car window easily with a pointy object. The tip of my baton works well. Also the tip of a stiff bladed pocket knife will work too. Word of warning with the spark plug insulator. If you have a piece on you & you're searched, you'll probably go to jail for possession of burglary tools.