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My dog's hind legs have suddenly been giving out on her a little bit, and she stumbles. Why would that be?
She is 1 year old, female, never showed any signs like this before. She is spayed. She hurt her rear left leg one week ago--ran into a table while playing--limped for a little bit, but then seemed perfectly fine (took her home). She showed no adverse signs after that and played perfectly fine this whole past week.
She is alert, responsive. Sometimes seems disoriented a little bit when she stumbles. Still wags her tail though, drinks water, has appetite. Gums look good.
She does not appear in pain, and does not wince when we touch her hips/back legs. Other than her legs giving out on her occasionally while she is walking, she seems ok.
Stumbling and ataxia (drunken walk) are signs of nerve deficits in our geriatric dogs suffering from intervertebral disk disease, tumors and blood clots of the spinal cord, as well as muscular dystrophy-like diseases. At one year of age we don't expect such disorders but we do see congenital deformations of the vertebral column that may be pressing on her spinal cord and causing nerve conduction problems to her hind legs. Alternatively, she may be severely dysplastic - her hip joints may be poorly formed and not supporting her weight effectively. I recommend your having Stella's hips and spine X-rayed. I suspect that we'll find the answer by means of that imaging modality.
Could any of the conditions you listed above as possible causes occur so suddenly in such a young and healthy dog that had never shown any signs EVER of anything like this? It sounds like most of the conditions/issues you were alluding to are ones that normally take time to develop perhaps? Can the onset of something like that possibly be so acute?
Could it possibly be from a tick bite?
We were going to monitor her this night and see how she is doing in the morning. Do you think this is something that requires immediate medical assistance?