It wasnarrated that Sufyan bin Abu Zuhair said:
"I heard the Prophet(ﷺ) say: 'Whoever keeps a dog that he does not need for farmingorherding, one Qirat will be deducted from his (good) deeds eachday.'" (FR)
English reference (FR): Vol. 4, Book 28, Hadith 3206 (FR)
Arabic reference (FR): Book 28, Hadith 3327 (FR)