Dog with broken back. Can she be saved?

Hi, my dog was recently hit by a car and has been lame on the back side since the impact. Today the vet said that her back is broken and wanted to put the dog down. However, she is able to pull herself around, go to the bathroom and adapt without the use of her hind legs. I am looking for any alternatives available - dog cart/wheelchair, advice from other experienced pet owners or vets - is there any way to not put her down and let her live with a broken back? PLEASE help -thank you