Dwarf Fortress Bug Tracker - Dwarf Fortress
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0000858Dwarf FortressCreaturespublic2010-04-09 00:562014-07-23 07:53
Toady One 
nonefeaturehave not tried
0000858: Livestock strangely agressive.
After my carpenter failed to build a wall on the haunted tundra, a werewolf got in. As expected, all the dogs charge and all the dwarfs scattered. Unexpectedly, the livestock joined in the headlong attack. The bull I can understand, although his wrestling maneuvers were a bit odd, as per http://www.bay12games.com/dwarves/mantisbt/view.php?id=373. [^] However, the cow and horses also attacked.

I seem to recall in previous versions benign livestock would flee from aggressive creatures, so I'm assuming this is not as intended.
Embark in an area with dangerous wildlife, bring some cows\horses. If they attack, your livestock will fight back aggressively, rather than flee.
Issue History
2010-04-09 00:56GReadNew Issue
2011-04-01 13:03FootkerchiefTag Attached: Intentional/Expected?
2011-08-23 14:25krazykatboyNote Added: 0018617
2011-08-25 07:39acetech09Note Added: 0018625
2014-07-23 00:18thvazNote Added: 0027291
2014-07-23 00:19thvazTag Attached: CLOSE THIS
2014-07-23 07:03FootkerchiefNote Added: 0027303
2014-07-23 07:03FootkerchiefStatusnew => resolved
2014-07-23 07:03FootkerchiefFixed in Version => 0.40.01
2014-07-23 07:03FootkerchiefResolutionopen => fixed
2014-07-23 07:03FootkerchiefAssigned To => Toady One
2014-07-23 07:53thvazTag Detached: CLOSE THIS

2011-08-23 14:25   
I've had that occur as well. Who knew lambs were so dangerous? They also seem to break out into infighting every so often, but that actually makes some sense.
2011-08-25 07:39   
yeah - I've had my livestock do some minor wrestling moves with other creatures in my farm - probably like in real life rutting or something like that. Normally the do a few wrestling moves then get away, but one time a yak held a stranglehold on a lamb till it died.

Perhaps the animals were cornered, and in that case it'd be intentional/expected. But if they were on an open field, saw the werewolf, and jumped in, keep those horses and throw them in the military.
2014-07-23 00:18   
As all the morale system changed, this doesn't happen anymore.
2014-07-23 07:03