´It was narrated that Abu Dharr said:` “I asked the Messenger of Allah (ﷺ) about the all-black dog and he said: ‘(It is) a devil.’”
Related hadith on this topic
Explanation & Benefits
Maulana Ataullah Sajid
Benefits and Issues:
There is an indication in this that one should not keep a dog whose entire body is black.
If it is prohibited to keep such a dog, then rearing or using it for hunting will also be prohibited.
And Allah knows best.
Source: Commentary on Sunan Ibn Mājah by Mawlānā ‘Atā’ullāh Sājid, Page: 3210