HARDEST RIDDLE EVER!!!!!?

I need some help answering this one! I have been trying to figure it out, but I do not have an answer that works! Please help!

The riddle is:

It barks but never sleeps. Itches when you don't scratch it. Never dies, but was never born. You can hold it in your hand, but not in a bucket. It can save you life if you never use it and it can never fall if you don't drop it. What is it?
 
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