I want to like Teak as a character and give him the benefit of the doubt, really I do, but it feels like his aggression towards Luke is way too exaggerated without any real reason being given or even really alluded to, especially compared to Teak's interactions with the rest of the cast. Like, Teak will be having a relatively normal interaction with another dog, then stop just to yell across the room at Luke to screw-off and die; he's cartoonishly mean to Luke and we aren't given anything close to a real explanation for it other than what basically amounts to an offhanded "Don't take what Teak says personally; he's just racist!", and that's only if you bring it up while cooking with Burry.
I just can't take Teak seriously as a character because of how little acknowledgement and consequence there is for Teak's behavior - the exact behavior that got Cooper severely injured and almost killed him. In fact, Cooper seems to be the only character that does take Teak's behavior seriously and reprimands him for it.
We see Teak have some relatively positive/emotional/constructive interactions with characters other than Luke, but the way I see it, all it really accomplishes is calling further attention to just how unreasonably antagonistic Teak is towards Luke. All I really want is for just a little more depth to be worked into this plotline; a few small allusions to Teak having some kind of deeper, more complicated feelings/thoughts of Luke, or if more characters were to genuinely acknowledge Teak's behavior and say/do something about it, or something! There really is more to Teak's character than just being an aggressive, self-absorbed asshole, but that's the only aspect of Teak's character that's ever directed at Luke and it just makes him feel more one-dimensional than he really is, which is a real shame for one of the main characters of an otherwise great game.