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Hello. Thanks for the question.
If you want to know what this is for sure, then you'll need an MRI of the spine. If this is an FCE, then these dogs can have a pretty good prognosis. It usually takes ~ 2-3 weeks to get full function back, so you have to be patient. Physical therapy and time are the important parts of treatment.
If things worsen over the first 1-2 weeks, then I would start to worry about a spinal tumor or disc herniation. Those can require surgery to decompress the spinal cord.
If you're able, I'd get an MRI to know what you're up against. If it's not an option, then I would do range of motion physical therapy, balance exercises and just give him time for 2-3 weeks.
I hope this helps, let me know if you have any other questions.