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Wow! That is totally not normal and I can't imagine that would be from an injured leg.
Is he able to stand and walk?
When did you take him to the vet?
Is he eating and drinking?
Oh, pain meds...
What medicines is she on?
Why did the vet want to do bloodwork for a sprained leg?
Can you check something for me? Can you feel all her feet and see if the paws are all the same temperature?
Can she stand or walk if you put her on her feet?
She could have a fever. Do you have a thermometer?
Just a plastic digital thermometer that you use on humans is good. Take is rectally until it beeps.
The anal tone recheck was to see if the nerves that control her anal tone were still functioning.