IVDD is Intervertebral Disc Disease and common with Dachshunds due to their unnatural elongated back. I have had several Pekingese that had this and usual the only solution is surgery but It is expensive and man people can't afford it so the vet will treat with medical management.
there are tons of info on Google search. Do not let a dog jump or climb on stairs, furniture, etc. As It aggravates the situation which many petowners fail to do. I always carried my dogs rather than allowing them to climb or jump anywhere.