Dog Update

This past Monday, I wrote about my attempt to help an overheated dog. Two days later, during my next run, I noticed that both dogs, instead of just one, were moving about freely in the fenced yard. It made my day. Today, things were the same. It would be a post hoc, ergo propter hoc fallacy to infer that my talking to the owner caused him to untie his dog, but it's possible that my intervention made a difference. Next time I see the man, I'm going to thank him. Or maybe I should leave well enough alone. What do you advise?