I was just walking home with my dog today, when I saw a neighbour's dog walker taking their two dogs out. The younger dog a lively labrador, was running free with the lead still attached. She was all over the front gardens of several houses and even ran across the road, it's a very quiet close, so not especially worrying. She stopped and ate something in someone's front garden.
The dog walker wasn't making any attempt to get the dog back, although later, when they returned she was holding the dog's lead.
If that was my dog, I wouldn't be happy.
My question is, do I tell my neighbour? Or is it none of my business?