What is the ruling about selling dogs?
Are there different rules depending on the type of dog or the purpose for which the dog is intended?
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Narrated Abu Mas`ud:
The Prophet prohibited taking the price of a dog, the earnings of a soothsayer and the money earned by prostitution.
حَدَّثَنَا عَلِيُّ بْنُ عَبْدِ اللَّهِ، حَدَّثَنَا سُفْيَانُ، عَنِ الزُّهْرِيِّ، عَنْ أَبِي بَكْرِ بْنِ عَبْدِ الرَّحْمَنِ، عَنْ أَبِي مَسْعُودٍ ـ رضى الله عنه ـ قَالَ نَهَى النَّبِيُّ صلى الله عليه وسلم عَنْ ثَمَنِ الْكَلْبِ، وَحُلْوَانِ الْكَاهِنِ، وَمَهْرِ الْبَغِيِّ.
From the above Hadith, as well as many other Authentic Ahadeeth, it is haram to sell a dog, whatever kind it is (even those dogs which are halal to have, like a hunting or farm dog). So in short conclusion, no there is no different rulings depending on the type of dog.
For more information, see this(Arabic).