How do I get over the loss of a dog?

I had a 1 and 10 mnths. old puppy. She is a border collie and she was outside on our property and a car swerved and hit her on purpose and dint stop. I cant get over the loss of her. She was the best dog anyone could ask for. She really made me happy. Now that she is gone I dont know what to do.. Please help me!!