Sayyiduna Ibn Umar (may Allah be pleased with them both) 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 a hunting dog, two qirats are deducted from his deeds every day."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 13136