Musnad Abu Ya'la al-Mawsili 153:138

Yahya ibn Ayyub narrated to us, Ismail ibn Ja'far narrated to us, Muhammad—meaning Ibn Abi Harmalah—informed me, from Salim ibn Abdullah, from his father, that the Messenger of Allah (ﷺ) said: "Whoever acquires a dog, except for a livestock dog or a hunting dog, a qirat of his deeds will be deducted every day." Abdullah said: And Abu Hurairah said: "Or a farm dog."