My dog will not stop barking?

unfortunately your dad by picking your dog up when it was around a large dog did not allow your dog to experience a large dog. your dog now fears large dogs. I have a small tough dog who beat a rottie in a play fight since then the rottie and my dog get along great no fights the respect each other. when i walk my dog at the park and people with large dogs won't let my dog and their dog play I say let them play. we are hear if it starts to get out of hand we break it up. the best thing you can do is to try and get your dog to be comfortable with big dogs. a neighbor has the same problem. But my dog and her dog are slowly working out their relationship.