http://www.eqraa.com/download/video/mualimhi.rm
As is known, Muhammad (peace and blessings be upon him) is described in the Quran as a "mercy to the worlds." It can be understood here that just as he is a vehicle of mercy for the whole human world, he has also been sent as a mercy for the realm of non-human creatures. In fact, at the same time he is the prophet of jinns, a group faithful to him whose existence we know about.
As much as he is the prophet of commanders, administrators, managers and the heads of families, he is also the prophet of the soldiers in the army, the people who are ruled and individuals in the family, which comprises the smallest building block in society . Finally, he is a vehicle of "mercy" for all the animals Allah created to serve man, the poor who comprise the lower class of society, widows and orphans and children. For his sake, people abandoned tormenting animals, looking down on the poor, confiscating the property of orphans and killing children. For this reason, we can say that Muhammad was the "prophet of mercy" for the whole human realm.