What the Conditions Are
Lumbosacral disease, also called degenerative lumbosacral stenosis (DLSS), happens when the bottom part of a dog’s spine where the lower back meets the pelvis starts to wear down with time. The discs, bones, and ligaments around that area can thicken or shift and press on the nerves that go to the back legs, tail, and bladder. This nerve pressure causes pain and trouble moving. It is one of the most common causes of chronic back pain in dogs, especially medium to large breeds and working dogs, like police or military K9s. The signs include back pain, weakness in the hind legs, not wanting to jump or stand up, and sometimes bladder or bowel issues. DLSS is usually diagnosed with physical exams and advanced imaging like CT or MRI, and it is often treated with anti-inflammatory medicine, activity changes, rehabilitation, epidural injections, or surgery if needed.
Tethered cord syndrome is different. Instead of the nerves being pinched by wear and tear, the end of the spinal cord itself is held too tightly in place inside the spine. Normally the spinal cord should be able to move a little as the dog bends or stretches. When it can’t, that pulling can irritate the nerves and cause pain and neurologic signs. In the study published in Journal of Veterinary Internal Medicine by Lampe et al., 12 dogs with signs of low back pain and trouble walking were diagnosed with TCS using MRI. After surgery to release the tight tissue, all of these dogs improved a lot.
How Their Signs Can Feel the Same
Both conditions can make a dog ache in the lower back, hesitate to jump or climb, have weakness in the back legs, or even lose bladder or bowel control. Because the signs overlap so much, tethered cord syndrome can be confused with lumbosacral disease. This is especially important if a dog doesn’t get better with usual LS disease treatments, requiring vets to look more closely for TCS with advanced MRI studies.
How They’re Diagnosed
For LS disease, vets look for changes like disc degeneration or nerve compression around the L7–S1 junction on CT or MRI, and combine that with physical exam findings. Tethered cord syndrome diagnosis depends on seeing how the spinal cord moves (or doesn’t move) in the MRI and finding that it is stuck too tight.
How They’re Treated
LS disease is often managed first with medicine, physical therapy, and careful activity control. Some dogs get injections near the affected nerves, and others may need surgery to relieve compression. Tethered cord syndrome may require a specific surgery that releases the tethered spinal cord, which, in the Lampe et al. study, led to improvements for all the dogs treated.
Why This Matters to Dog Owners
If your dog has ongoing lower back pain or neurologic signs and haven’t improved with typical DLSS care, tethered cord syndrome is one of the conditions your vet may consider. Both problems need careful diagnosis, and the right imaging tests like MRI can help tell them apart so your dog gets the best treatment.
Read more about tethered cord here – https://drbrunke.blog/?p=701
Read more about LS disease here – https://drbrunke.blog/2025/09/08/degenerative-lumbosacral-disease-in-dogs-from-working-heroes-to-family-companions/
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