Hello, thanks for your question today! I am Dr. Drew, and I am a licensed veterinarian. I'll be happy to help you in any way I can.
From your description, there may be a neurological issue, involving the spinal cord, causing this situation.
it is also possible that there's been damage to the Cruciate Ligament,
which is a ligament that helps support the knee joint. This is a common injury in dogs.
Without a physical examination, it can be quite difficult to determine the difference between these 2 issues,
I do not know of any injury that she has suffered.
there is often no history of injury, in cruciate ligament rupture cases -- the ligament degenerates over time, until it eventually tears completely.
a spinal tumor or a bulging disc in the spine could also cause these symptoms.
Also, inability to stand or walk, could be caused by low blood pressure,
if the gums look very pale, then there may be internal bleeding, such as from a tumor on the spleen,
another common problem in elderly large breed dogs.
Thank for your help. I'll get her to her vet as soon as I can.
you are very welcome - I hope Laika does well.