Does the leg feel hot or cold?
Are the nail beds blue?
Does he have claws?
Are his eyes darting back and forth?
How long is he like this?
Is he eating?
It sounds like he may have been in a fight or fell out of a tree.Shreeded nails indicate defensive moves.
If you dont see any wounds they may be internal. He may also have ingested a toxin.
I dont think the groggyness is related unless he has a head injury but I do feel he should be seen ASAP.
Feel all over his body and look in his mouth for any abnormalities. If he was bitten you would see evidence in swelling or black necrotic tissue somewhere.
His inability to reach his box is another serious symptom.The only way to tie these things together is neurologically.
So I do suggest an immediate hands on vet exam
Please let me know what is found and how he is doing. I will be here all day waiting to hear from you.
I hope he will be fine.
Sincerest best wishes for him,
Oh the poor guy!
Please let me know how he is doing.
Thanks for your accept,