Sahih Muslim – Whatever is forbidden to Eat is Forbidden to Sale

Salim reported on the authority of his father (Allah be pleased with him) that Allah’s Messenger (may peace be upon him) said: He who kept a dog other than one meant for hunting or for the protection of the herd would lose two qirat of his deeds every day. Salim said: Abu Huraira (Allah be pleased with him) used to say: Or the dog meant for watching the field, and he was the owner of the land.