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This paw problem is often a symptom of diabetes. With diabetes, the feet and hands of people will get tingly and not have as much feeling. Pets react in much the same way.
If he is better today, this might BE a blood sugar issue that will fluctuate.
No matter what, you really need to see the vet to have this checked as soon as you can. Keep some karo syrup on hand in case his blood sugar drops dangerously low. You can use a little on the tongue to bring him back around.
Does this help more?
Let me know if you still have questions.