Sayyiduna Abdullah bin Umar (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) said: "Whoever keeps a dog other than a dog for guarding livestock or for hunting, two qirats will be deducted from his reward every day."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 11021