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40d:Cat cancels Store Item in Stockpile: Too injured
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Your cat kills a vermin.
It reaches down to pick it up.
It 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.
This error message is actually caused by an old bug in the system which was reintroduced in 40d. When a pet cat kills a vermin it will attempt to pick it up and carry it to their owner, to bask in the display of gratitude that every cat owner shows upon being gifted small dead animals.
However the cat's mouth does not possess the [GRASP] tag, so it registers as unable to pick up the item and so generates this error message. Frustratingly, secondary programming picks up the task and lets the cat carry the vermin anyway.
Fixing the bug
As your cat and vermin population expands this message becomes more and more common, but it is easy enough to fix by modding (the exact steps are explained below). You don't even have to generate a new world.
Step One
Open raw/objects/body_default.txt and add a new entry:
[BODY:CAT_MOUTH] [BP:CAT_MOUTH:mouth][CONTYPE:HEAD][MOUTH][SMALL][EMBEDDED][APERTURE][GRASP]
This creates a new body part in your dwarf universe. Specifically, a mouth which can pick things up. Now we need to attach this body part to the cat!
Step Two
So open raw/objects/creature_domestic.txt and edit the cat to:
[CREATURE:CAT]
[NAME:cat:cats:cat]
[TILE:'c'][COLOR:0:0:1]
[VERMINHUNTER]
[PETVALUE:20]
[CARNIVORE][NATURAL][PET]
[LARGE_ROAMING]
[COMMON_DOMESTIC][BENIGN]
[PREFSTRING:aloofness]
[BODY:QUADRUPED:TAIL:2EYES:2EARS:NOSE:2LUNGS:HEART:GUTS:ORGANS:THROAT:NECK:SPINE:BRAIN:CAT_MOUTH]
[BODYGLOSS:PAW]
[SIZE:3]
[MAXAGE:10:20]
[ATTACK:MAIN:BYTYPE:MOUTH:bite:bites:1:6:GORE][ATTACKFLAG_CANLATCH]
[CHILD:1][CHILDNAME:kitten:kittens]
[FAT:1]
[DIURNAL]
[STANDARD_FLESH]
[HOMEOTHERM:10070]
[LAYERING:100]
[SWIMS_INNATE][SWIM_SPEED:2500]
[MUNDANE]
And you're done.
Note that you don't have to edit the [ATTACK] line, even though it contains a MOUTH too. This is because the "mouth" in this case is referring to a Tag, not a Body-part (you'll note that our CAT_MOUTH has a mouth tag, too).