I had a similar situation recently at work (I work at a pet supply store). A man brought his aggressive Rottweiler in and Teddy was off-leash in the store (he is social and does fine with everyone as long as he is supervised, and the store owner's dog is also off-leash daily). The Rottie saw Teddy coming to greet him and started growling, I told Teddy to "wait" and he stopped dead in his tracks halfway between me and the Rottie. Meanwhile, the Rottie started growling and lunging at Teddy and ended up gouging his owner's arm with his claw. I picked Teddy up and put him safely in the office and went about my workday. A few minutes later the owner came by to show me how bad he was bleeding and tell me (very rudely) that he was injured because of MY dog and that I need to learn to control him. He went outside and told my manager (who is also my friend) "That bitch needs to control her little dog." He lied and said that Teddy had bit him, and my friend looked at the cut and said, "Sorry, I know Teddy and he would never do that. Besides, how would a five- pound Chihuahua cause that much damage?" I was livid because Teddy has never bitten anyone or anything, and I don't think he ever would. 
Some people just don't want to take responsibility for their own animals and will do anything to blame others. It's ridiculous. I'm so sorry you had to go through that, though. It must have been terrifying.
Some people just don't want to take responsibility for their own animals and will do anything to blame others. It's ridiculous. I'm so sorry you had to go through that, though. It must have been terrifying.