My staffy pup is 7 months old and a few weeks ago her back legs just stopped working for no reason?

I am sorry Dionne to hear your problems.Seems to me that SOME vets only want your money.I would try the P.D.S.A. They seem to have better facilities for treating the more serious illnesses.I would not like to try and guess what the problem is.Good luck with your dog,hope she gets better soon.