Near us we regularly meet a child maybe 10 years old or so walking a bull terrier type (i.e. big and very strong) puppy who is now 6 months old or so. She is gorgeous, completely friendly but she is so strong. He struggles to hold onto her (she wears a chest harness) and she's only going to get bigger and stronger. I am concerned that one day she'll pull him over or into the road, or get away from him. She almost did so today trying to say hello to our dog. I don't know where he lives and I never see him with his parents.
Can I do anything? Should I do something or stay well out of it?