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If he can't get up at all, you need to see the vet immediately. This could be a treatable condition today but not be one tomorrow.
He may be having some problems with aging or it could be a back or disc problem. It's impossible to tell without seeing the vet.
Let me know if you still have questions.
How long was the progression from rear limb problems to front limb problems?
There are spinal injuries that can cause paresis...but the other thing that causes "ascending paresis" which means from the backend forward, is Tick Paralysis.
Before you go to the vet tomorrow, which I suggest if this doesn't work...
You and a family member need to sit down and literally pick thru this dog for the tick. It only takes one with the toxin. Do not assume because you pull three off...it is one of those three. GO THRU EVERY TOE, INSIDE/OUTSIDE EAR, look on face around the eyes, armpits, rectum, genitals. I can not tell you in NC how many times we see this and people swear there is no more ticks...and I find one. If you can dedicate about an hour of time to pick thru your dog...this may save you some $$.
After the removal of the tick, if that is the cause, recovery is within 24 hours and complete.
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With neurological signs there is not much more you can do at home. The vet has to do a series of reflex type exams to try to figure out if the problem is in the spine or brain or other issue.