It wasnarrated that Abu Hurairah said:
"The Messenger of Allah (ﷺ)said: 'Whoever keeps a dog, one Qirat will be deducted from him(good)deeds every day, except a dog for farming or herdinglivestock." (RU)
English reference (RU): Vol. 4, Book 28, Hadith 3204 (RU)
Arabic reference (RU): Book 28, Hadith 3325 (RU)