Abu Hurairah (RAA) narrated that the Messenger of Allah (ﷺ) said:
'If anyone owns a dog except a sheepdog, a hunting dog, or a farm dog, a carat of his reward will be deducted daily." Agreed upon. (DE)
English reference (DE): Book 12, Hadith 1372 (DE)
Arabic reference (DE): Book 12, Hadith 1332 (DE)