Sahih Muslim
The Book of Transactions (Kitab Al-Buyu)
Book Number: 010 / Hadith Number: 3820
Salim b. Abdullah reported on the authority of his father that Allah's Messenger (may peace be upon him) said: Whosover amongst the owners of the house keeps a dog other than one meant for watching the herd or for hunting loses two qirat of his deeds every day.