Musnad Abu Ya'la al-Mawsili 153:27

Abu Khaythama narrated to us, Waki' narrated to us, Hanzala narrated to us, from Salim, from his father, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Whoever acquires a dog, except for a hunting dog or [a dog for] livestock, two qirats of his deeds will be diminished every day." He said: And Salim said: Abu Hurayra said: "Or a dog for tillage." He said: And he was an owner of tillage.