It is narrated from Hazrat Abu Huraira (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: Whoever keeps a dog for purposes other than hunting or guarding fields or herds, then every day a qirat will be deducted from his reward (and one qirat is equal to the mountain of Uhud).
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 8547
Hadith Gradingحکم دارالسلام:حدیث صحیح ، خ : 2322 ، م : 1575 ، وإسنادہ ضعیف لجھالة والد سلیم