Wa `alaykum as-Salamu wa Rahmatullahi wa Barakatuh.
There are numerous hadiths which prohibit the selling of all types of dogs. `Awn bin Abu Juhaifa narrated that his father bought a slave who practiced the profession of cupping. I asked my father why he had done so. He replied, “The Prophet (peace be upon him) forbade the acceptance of the price of a dog or blood, and also forbade the profession of tattooing, getting tattooed and receiving or giving Riba, (usury), and cursed the picture-makers.” (Al-Bukhari)
According to the report of Abu Mas`ud Al-Badri who said,” The Messenger of Allah (peace be upon him) prohibited the price of a dog, the earning of an prostitute, and the money given to a soothsayer (Al-Bukhari and Muslim)
This is the view of the majority of scholars including Shafi`i and Hanbali scholars.
But the Hanafi scholars permitted the selling of dogs generally while Maliki scholars permitted the selling of guard dogs only. They based their view on the hadith of the Prophet, narrated Abu Hurairah who reported the Messenger of Allah (peace be upon him) saying, “Whoever keeps a dog, one Qirat of the reward of his good deeds is deducted daily, unless the dog is used for guarding some farm or cattle.” Abu Huraira (in another narration) said from the Prophet, “unless it is used for guarding sheep or farms, or for hunting.”
Narrated Abu Hazim from Abu Hurairah: The Prophet (peace be upon him) said, “A dog for guarding cattle or for hunting.”
Those scholars maintained that as long as the Prophet exempted those types of dogs from prohibition, they are allowed to be sold and purchased because the only way of procuring them is by sale.
I prefer the view of Maliki scholars and therefore, you can sell those dogs on the condition that they will be sold for the sole purpose of guarding homes or sheep.
Allah Almighty knows best.
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