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What do I do about this guy who keeps his dog in his car while he works?

I work for a commercial cleaning company. There is a construction company in town and they have an office building where the managers work. About a week ago, it was 60 degrees outside and I saw a dog in a truck. I wasn't sure who the owner was but my shift was about an 2 and a half hours and I think the dog was in the truck the entire time. At one point I couldn’t see it but I think it was laying down. It wasn’t panting or anything so I didn’t do anything. A couple days after that I was working at the same place. It was raining and I didn’t see the dog in the car but I know for sure who the owner is now. he's the project manager who works inside. I was gonna wait to see if he did something like that when its hot out and confront him. The only thing in worried about is how awkward it would be afterwards. I empty his trash everytime im there and have to interact with him. It would be even more awkward if I have to call the cops. What if he complains to the company I work for and gets me fired? What do I do?
What do I do about this guy who keeps his dog in his car while he works?
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