شِبَعَهُ is its eating to fullness, رِيَّهُ its drinking sufficiently, رَوْثَهُ its dung, and بَوْلَهُ its urine. Mentioning ordinary bodily functions shows that daily upkeep matters in a long-term responsibility.
Example 1: Anyone entrusted with an animal must supply suitable food, water, rest, and safe shelter.
Example 2: Overworking an animal or neglecting its basic needs because it is useful contradicts the ethical emphasis on responsible care.
The precise promise of reward here concerns a horse dedicated in Allah’s cause; the wording should not be mechanically extended as an identical promise for every situation.