I would make the call!

Last summer i was working for a friend planting flowers and behind her house there was a Rottweiler about 1 year old, he started looking very thin and i knew the owners were not caring for him properly by the likes of their yard and he was always out in the very hot weather with no water. I drove around the block and got their address and had planned on calling the Animal Control, and i was also afraid they would know it was me or my friend, so i decided to think about it some more, well a week later, the dog was not there, and i found out he had died of Parvo.
i cried i was so upset, that i hadnt called earlier, not that it was my fault but had i made the call sooner maybe he could of had a chance, but the people just didnt care, anyway, i think the dog may need help. so i think u should call.