The life of a domesticated stallion is always lonely. While not competing, they spend solitary hours in their stall or in a field, far from the mares, although their olfactory sense assisted by their (Jacobson's) Vomeronasal organ can detect a mare's pheromones (it is said) up to 1/4 of a kilometer away.
17th and 21st C. -- views of the magnificent water fountain "Char d'Apollon dans le bassin d'Apollon" at Palais Versailles, France, by Louis de Chastillon