Don't panic too much. Our 6 month old EBT got pounced on yesterday by a small black ball of fury.
It's owner must have known as it had a soft cloth muzzle on, but it was REALLY going for my dog. Mine hit the deck in full submission pose, belly flat to the ground, head down [new behaviour, took a few weeks of being growled at for him to learn to be polite] and the little black ball just kept coming. Owner comes across and ask if my dog is OK with it???????
Then, and I a promise I am not joking, she takes its muzzle off it to give it a treat and pet it and it flew for my dog again. I picked him up and asked if she could put hers on a a lead (mine was) and it turns out she didn't have one with her!!!!!
Thankfully a friend with a HUGE dog ambled up and she picked up her still snarling ball of fury and walked off moaning about other dog owners having no consideration.
My trembling pup was absolutely fine after 20 minutes of being bounced by the humongous German Shepherd 
He has been equally fine today with quite a few dogs of all sorts of sizes and temperament. But, whilst he is seemingly fine, I won't forget her or her dog for a while, I was horrified!
Sorry, I meant that to be reassuring. Pups are often more guided by our reaction to an incident than their own. So just take yours out again and try not to be too tense though the lead when you meet some dogs!
Good luck!