All of them.

The thing is, I met a talking dog, and not being prejudiced I listened to his plight and agreed to help him out. How was I meant to know that I was sending my ultra good-guy character on one of the infamous "Daedric Quests"? As I followed my canine companion along the road two armoured fighters rushed out of the woods and I instinctively moved to defend my new friend. Only when Ria lay dead at my feet did I realise in horror that the attackers were Companions, who I also happened to lead. Well, you can imagine how the rest went down. I was forced to kill the others due to their sudden (but not so mysterious) animosity towards me. Now my good-guy is tainted forever, and he has to live with the ghosts of his former friends on his conscience. You can also add a few Vigilants of Stendarr to my bodycount too since they now attack me on sight, and I weep as I hew them down.

The thing is, how was I meant to know I was taking a Daedric quest? I avoid all spoilers for games like Skyrim and on the one hand I think "okay that's fair enough, I guess evil doesn't always announce itself", but on the other I think, "that's annoying". My Oblivion obsessed friend assures me that this is perfectly in line with the Daedric Prince in question (I never got really into the lore myself) and so again, I think it's kind of okay. I almost like my Anakin-esque fall from grace. Is there any way I can earn redemption though? It doesn't matter so much in terms of the Companions, since they're dead, but I hate to be marked as an "Evil One" for trying to help a dog out on a rainy night.

EDIT: Oh yeah and some of the Companions took considerable murdering. They kept going into that "prone" stance until I eventually triggered a fatality on them. It's the only way to be sure.

The Daedric prince you're referring to would be thrilled with this story. He is fond of tricking mortals.

Go to the churches and seek forgiveness from the gods....
If you have a bounty pay it off
Help the preists with any troubles they have
And if you can donate to there church then do so

Other than that i have no idea...
He is a seedy sort
Kind of like molag bal.....except with less forced sixual assualts....

Vile's the sort that makes you believe you wanted it. You still feel dirty inside.

You can tell the type of quest you are on by the banner decoration around the quest name in your journal. Deadric quests have the oblivion symbol in them.

My thoughts as well.

OP, you should know nothing good will come of talking dogs, especially when maniacal deities are involved. My condolences, sir.

Though.. it did make for an interesting story.

I'm still crying myself to sleep after the Molag Bal episode... I keep telling myself he attacked me first but it just... it just doesn't get any easier.

Interesting story. I would reload. Because that [censored] is too sad.

I can't allow myself to do that unfortunately. It's one of my "house rules" that I never reload except upon death. I should also point out that I didn't actually do the quest. As soon as I'd killed my friends I abandoned it. But it seems that even just beginning it is enough to damn you in the eyes of the good creatures of Skyrim.