I remember my Dogmeat in Fallout 3 running away.
I know it wasn't a conscience thing, I just looked around and he wasn't there, it was weird.
Two days later I'm strollin' around and all of a sudden a popup tells me "Dogmeat has died".
I was like "... Alright."
I also remember a glitch in Skyrim that gave me a wolf follower.
He wasn't *really* a follower, just for some reason whenever I fast traveled, a wolf would appear right next to me. Wouldn't move, wouldn't attack, just sat there and growled at me.
I kind of liked him, even defended him from anybody who attacked him, got me in trouble with a lot of guards.