Walking my dog today, she was of lead, about 10ft ahea of me waiting for me to chuck the ball. A child cycled towards us, saw my dog (who is half toy poodle so tiny) and started screaming. My dog just looked at her and then carried on our walk, if she was the type to run up to strangers/kids she wouldn't be off the lead. However, when she was a puppy and less well trained this screaming was an invitation (in her mind) to investigate.
While I accept that some children are scared of dogs, and that is fine. I would have thought that if there is a dog in the general vicinity encouraging your DC not to scream is probably for the best when the dog is ignoring you completely. AIBU, we all want to use the local facilities happily.