I suspect that there were a lot of subtle elements lost in translation. Kuju Siam, one of my favourite mangaka, seems to be showing off the doggy side of humans and the human side of dog-spirits in this story. Yuuma is loyal, territorial and jealous; when Aoi's relationship with Hakumei threatens his brother, he barks wildly (issues threats) and when his own relationship with Hakumei is suddenly cut off, he tries to dominate Aoi by attacking him, but stops when Aoi submits out of physical weakness, like a guard dog. Aoi, himself, is very loving and nurturing. He's like a companion dog. Whereas the Inugashi mistresses, who are supposed to be half-dog, reveal very strong human characteristics: Hakumei's compassion and sacrifice when Aoi is ill, or when he thinks his brother is suffering because of their relationship; Minekuza's ruthless strategy and manipulation when Aoi explains he is afraid of the Inugashi's jealousy.
For people going on about the rape scene, Yuuma said later that he didn't follow through with it. He stopped before putting it in. So yea it was nasty of him to intend to do that, but he refrained.
Aside from that, this manga felt so rushed and I was confused as to what was happening half the time. It doesn't seem like it's well written. Overall it was a nice read, but nothing I would read again.