Sahih Muslim Book 10, Hadith Number 3822.

Chapter : Riba (Usury).

Abu Huraira reported Allah’s Messenger (may peace be upon him) as saying: He who kept a dog which is neither meant for hunting nor for watching the animals nor for watching the fields would lose two qirat every day out of his reward; and there is no mention of the fields in the hadith transmitted by Abu Tahir.