40d:Cat cancels Store Item in Stockpile: Too injured

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This error message is actually often caused by a bug in the system, existing in prior versions, and which was reintroduced in 40d. When a pet cat kills a vermin, it will attempt to pick up the vermin in its mouth and carry it to their owner. However, the cat's mouth does not possess the [GRASP] tag, so it registers as unable to pick up the item and generates the message. Secondary programming picks up the task and lets the cat carry the vermin afterwards. This bug can be fixed by modding the cat entity token by adding [GRASP] to the mouth part of the cat.

Alternate explanation

Your cat kills a vermin. It reaches down to pick it up with its hands, realizes it has no hands, cries out "My hands! My beautiful hands! Someone has chopped off my beautiful han... wait, I'm a cat. I don't have hands. Right," and then continues on with its business.