What should I do about this guy who keeps his dog in his car?

I work for a commercial cleaning company. I clean a building in a shopping center. Its like a big building with a bunch of businesses. There is a security guard who stands right outside. I've seen him walking a dog several times, and it turns out he keeps the dog in his car behind the shopping center. I'm pretty sure he checks on the dog often, bit it was 91 degrees today, and he still kept his dog in the car. I dont wanna talk to him because what if he ignores me then ill have to call animal control on him.

What should I do about this guy who keeps his dog in his car?
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