A few weeks ago, I saw a Muslim woman on the news who had brutally killed an innocent dog. And she explained to the camera saying what she did was not against Islam and it was completely halal, she even said killing black dogs is sunnah and it is rewarded! I couldn't believe what I heard, so I searched it a bit.
Indeed, I found some hadith which Prophet Muhammad ordered all dogs to be killed, and then he abrogeted it and he ordered only black dogs to be killed. I thought it is haram to kill any innocent animal, whether it is black or white... Is it really a sunnah to slaughter black harmless dogs just because their fur is black, as that woman on the news said? I'd appreciate if anyone clarifies this.