Companion in blind rage, illogical messages
The messages are somewhat illogical when a pet goes into blind rage.
I had my trusty cave bear attack an acid vortex. Not surprisingly, it suffered heavy damage and went to be critically injured. For a few turns after that, it was still tame and non-panicking. But then, it decided to fight to death in blind rage and attacked me, even though I had not been aggressive against it in any way. Trying to re-tame it with music was hopeless, and when looking at it, I got the following message:
"This is a cave bear. It is hostile. It appears to be very experienced. The cave bear is critically injured."
So, a basic hostile monster now. But when I killed it, I got the message "You are horrified by the death of your friend!" I don't know if it affected my alignment.
Not sure if it qualifies as a friend anymore at that stage. ;)