كتاب الطهارة
2  
The Book of Purification
(27)
Chapter: Rulings on what was licked by a dog
(27)
باب حُكْمِ وُلُوغِ الْكَلْبِ ‏‏
Sahih Muslim 279b

This hadith has been transmitted by another chain of transmitters in which there is no mention of" throwing away".

وَحَدَّثَنِي مُحَمَّدُ بْنُ الصَّبَّاحِ، حَدَّثَنَا إِسْمَاعِيلُ بْنُ زَكَرِيَّاءَ، عَنِ الأَعْمَشِ، بِهَذَا الإِسْنَادِ مِثْلَهُ وَلَمْ يَقُلْ فَلْيُرِقْهُ ‏.‏
Reference : Sahih Muslim 279b
In-book reference : Book 2, Hadith 115
USC-MSA web (English) reference : Book 2, Hadith 547
  (deprecated numbering scheme)