Neighbor leaves dog in the rain

I have a neighbor that has an outdoor dog. he doesnt treat it like family like we treat our dogs, but now its raining and the dog has no shelter and is literally just standing in his backyard in the rain. it is honeslty so cruel and as a dog lover I hate seeing it. Is there anything i can do?

I've asked him if i can give it treats and he said yes but has texted my husband a few times asking if i gave it a treat and it seemed like he was upset by it.