Beowulf's Surgery

On Sunday, April 9 my mother and I took my dogs for an afternoon walk. We encountered a homeless camp with a dozen or so tents and structures. An unleashed pit bull mix exited a tent and ran straight for us. He grabbed a hold of my chihuahua mix, Beowulf, and refused to let go until several people intervened. When it was all said and done Beowulf's front leg was severely mangled. His radius was broken and his ulna was ripped away from the joint and stabbed out of this skin under his "elbow." He received bite wounds and bruising to his abdomen. 


Beowulf is my adventure dog who loves hiking, camping, and rafting down rivers. I was initially told by the vet that Beowulf would likely lose his leg. The bone and tissue damage is very severe. It is very important to me that Beo is able to do things he enjoys most, so I made the costly decision to attempt the repair in lieu of an amputation. Additionally, my mom received eight stitches and a tetanus shot for dog bite wounds on her hand.
Any help would be greatly appreciated! It's impossible to plan for expenses like these and the fact that the culprit's owner is homeless means that I will receive no compensation. 
http://www.kgw.com/news/local/woman-says-pit-bull-attacked-her-mom-dog/430315965