My name is ***** ***** I’ve been involved professionally with dogs in the health and behavioral fields for over 18 years. It will be my pleasure to work with you today.
As I'm sure you are aware, dachshunds are prone to disc problems. An intervertebral disc that has slipped or ruptured up into the spinal canal causes inflammation of the spinal cord, which in severe cases causes paralyses of the rear legs. You can read about this here:
It's entirely possible your dog has this condition or has injured her back. You can read more about this here:
It may be that she twisted and has some swelling of a disc or that it is a degeneration of the disc. Buffered aspirin can be given to a dog with a dosage of up to 5-10 mg per pound every 12 hours. Keep in mind that a dog's body does not metabolize aspirin in the same way as a human and thus should not be given more than a day or two without contacting your Vet. The aspirin may need to clear your dog’s system before other medications can be given, so keep that in mind if you decide to give aspirin and be sure and tell your vet when your dog is seen. Read side effects and precautions here.
If you plan on seeing a vet within a day or two, I would skip the aspirin. Now some owners will try the aspirin and contain their dog in say a small crate to keep them as inactive as possible. Keeping them inactive can give the disc time to heal if it is an injury but if they are not kept inactive the disc can be reinjured pretty easily. So if your vet gives you medication to decrease the inflammation, I urge you to still keep her inactive for a week or so before seeing if there is improvement. Keep her on a leash when you take her out to eliminate but otherwise, limit activity.
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