Nice submission.
I can't decide if I like that Dren's mystery visitor was simply his love interest or if it bugs me. Now, it kinda bugs me because the set-up in the previous chapter makes it seem a lot more sinister. But then I think, "But the puppy wouldn't know if the intruder was dangerous or not, he's just going to think 'Big person- not my master- I'm scared.' It is a twist... but not a satisfying one, at least not for me. On the other hand, it does emphasize that due to their upbringing, they're more likely to assume the worst rather than dismiss an alarm as "nothing." So, yeah... just letting you know how that particular bit hit me. If you're going to go with the characterization bit of it, you need to make it more obvious.
I also thought it was rather odd that Garrik would be allowed to walk out of the Kings castle unguarded. Wouldn't they send at least ONE Talonguard with him? Within the bounds of the castle I can see it, but outside? Are they really that sure there won't be assassination attempts?
About the heritage. You've made it pretty clear that the Drakkin are considered "evil" by most of the humans, who- mostly by default- are followers of Doreala. They are also a different species. That makes me think that, while interbreeding might be possible, it's probably not a) common, or b) likely to be believed out of hand when the possibility is first introduced- unless there are previous instances of such a thing: myths, legends, and/or aesops. This is one of the times when a bit of history could be wedged in: a memory of some old story teller relating the fate of a cursed half-blood, or something like that. Those two considerations also make me doubt Karrys' calm assurance that Garrik's possible heritage means nothing to her. Sure, it's the nice, reasonable, politically correct thing for her to say, but is it really believable? Garrik's reaction of fear, horror, and shame, on the other hand, is much more believable.
Overall, pretty good. Just a few things to clear up.