William's service dog

My name is Storm and I am the mother of a 9 year old "autistic runner".   Keeping up with him has always been a task and a huge fear is that he will run off and be hurt because he does not understand danger.  
The final straw was yesterday.  He is very anxious about the upcoming school year and we were school shopping. He rides in the grocery part of the cart, he shot out of it and headed out of the door at Walmart.  He is extremely fast and made it all the way through the parking lot and to the major street.  I was only able to catch him by jumping in a car.  It was the scariest day of my life, to realize that I couldn't protect him from himself anymore.  
I am trying to raise money to purchase a dog, get its license to be a certified registered assistance dog, and it's training.  As William has become more and more anxious the danger he places himself in increases.  
I will be forever grateful to any assistance I receive and I know God will bless him with this.  He has been praying for a service dog to help him calm down for a few years now.