[Insane]

Originally Posted by Sage Shinigami

Spoiler for comparison to manga:

Did Rei kill the dog in the manga? I swear I remember him being a more decent person than that. Decent meaning, "he only kills awful people". I fully admit I could be wrong--I read that manga when it first came out and stopped well before it got into the 40s.

Spoiler for answer:

Yes, he killed that dog in both manga and anime. He killed it in order to release it from its pain, not out of malice intent