Answered by Shaykh Rami Nsour
Question: I bought a dog a while back, but now my parents want me to get rid of it. I heard that money from selling a dog is haram. Is this the Maliki view?
Answer: According to the Maliki madhab, and other madhabs, it is forbidden to sell a dog. They take this ruling from the many Hadith which show that the Messenger of Allah (sal Allahu alayhi wa sallam) prohibited the sale of dogs.
One of these Hadith is mentioned in the Sahih of Imam Al-Bukhari which states, “The Messenger of Allah prohibited the price of dogs.” This ruling for the Maliki madhab can be found in the Chapter of Sales in the Mukhtasar of Khalil.
source : http://seekersguidance.org/ans-blog/2013/10/14/the-ruling-on-selling-dogs-in-the-maliki-school/