Aries and Sagittarius share a Hydrogen nature: expansiveness, activity and a taste for adventure, social life and life outside the home. That affinity can produce a lot of enthusiasm, but it can also intensify the clashes when neither tempers their impulse.
The image of the horse that represents Sagittarius points to their spirit and their need for a clear direction. If Aries takes the initiative and both accept that arrangement, they can move forward energetically. The difficulty arises when initiative turns into imposition or when Aries’s temper wears out Sagittarius’s patience.
An impulsive argument can leave wounds that last longer than the anger that caused it. Stopping before speaking hurtfully helps keep a disagreement from turning into a contest over who leads.