Sahih Muslim
The Book of Transactions (Kitab Al-Buyu)
Book Number: 010 / Hadith Number: 3822
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 anitmals 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.