Hi Ann
I've only just read your post, I'm sorry Trudy was attacked, you must have been very upset and also cross. I hope she's recovered now.
Lucy has a dog, and there are a couple nearby who have 3 black labradors. They take them for walks all 3 at a time. Lucy's dog Cassie has been attacked by these dogs on more than one occasion. I know it's hard to believe that labradors would do this, I can only think that because there are 3 of them they are working as a pack.
The owners don't seem at all apologetic or remorseful, and still walk them all together. Lucy & Gwynn wouldn't want to report them to the police, but I don't know what they can do to stop them terrorising other dogs.
Love Lyn