Hi Mandi, welcome to the forum. I'm really sorry to hear about your dogs..but I have to ask-what was the situation surrounding them getting hit by cars? And what have you done to prevent it from happening to your third dog?
Generally we ask that new members post an intro similar to the one here: viewtopic.php?f=17&t=64327
You've hit most of the the key points, but if you could just give us a little more info about you we'd be happy to approve you so you can start your research.