OMG!!! How horrible! I am so glad it wasn't worse for you and your little one. I hope the truck driver is ok.
I have horses and it has always worried me about them getting out, we are not on a major highway but its busy enough. We check the fences every week just to be sure everything is closed. I can't imagine what the people were thinking that own them, JHAP is right I am sure they will have to pay not only for your repairs but any other damage done. Don't let them get off scott free, for the horses sake alone, they SHOULD pay.

Chris