Had a strange thing happen today... Don't know if it is a bug or not.
Anyway, fighting an Umberhulk with my Animal Companion out. I sadly fail my save against it's attack and in the ensuing confusion, start to attack my companion. Thankfully it breaks quickly enough and we finish off the Umberhulk... only to have my Companion turn on me now. I had to dismiss it in order for it to stop before it killed me too :-\
Just seems like strange AI behaviour. Is it possible to make it so an Animal Companion will disengage after such an event?