"A man said: "O Messenger of Allah, what animals may we kill when we are in Ihram?' He said: "there are five for which there is no sin in killing them: Kites, crows, mice, scorpions and vicious dogs.'" (Using translation from Nasāʾī 2833)  

قَالَ رَجُلٌ يَا رَسُولَ اللهِ مَا نَقْتُلُ مِنَ الدَّوَابِّ إِذَا أَحْرَمْنَا؟ قَالَ خَمْسٌ لَا جُنَاحَ عَلَى مَنْ قَتَلَهُنَّ الْحِدَّاءُ وَالْغُرَابُ وَالْفَأْرَةُ وَالْعَقْرَبُ وَالْكَلْبُ الْعَقُورُ