help save duke.

we are trying to raise money to help with the veterinary costs for our 2 year old great dane. on sat jan 25th he all of a sudden could not bear any weight on his hind legs. we took to the animal hospital but they were unable to diagnose his injuries due to lack of an mri machine. they are referring him to nc state to get an mri. the vet said we are looking at anywhere between $1000 and $4000 on top of the $586 we owe the animal hospital. any thing would be greatly appreciated, i just can't fathom euthanizing him when he still is the kind living dog he is. thanks for your time and god bless.