Hi Penny
I also have dachshunds, and two of my three have had back problems in their lives :(
There are options for treatment, including surgery or sometimes the conservative treatments are recommended. If you choose to go the surgery route, follow any directions given by the surgeon. (Mine have both recovered with only conservative treatment, so I have no experience with surgery)
The most important thing is TOTAL crate rest, only being carried outside to toilet.
Feel free to email me if you would like more info ( minicoop@bigpond.net.au )
Pauline