Ok, firstly I'm sorry if this is completely the wrong place to post this but I couldn't find anywhere else.

All I want to do is say that this bug I'm getting really bugging me! During the companion questline I has asked by aela to kill the sabre tooth cat, so I trotted of to kill this cat and at some point I've either killed it before or something's already killed it and now there is the arrow pointing to it still say I have to kill this dead cat.
Do you think it would make sense to let people cancel missions (like the theifs guild) on companions ? Because I'm on 272 hours played and I haven't completed the companion questline!