What is the life span of grey horses generally shorter than other horses?

The life span of grey horses is generally shorter than that of other horses primarily because they are more prone to melanomas. Melanoma is a type of cancer that is particularly associated with grey horses due to the genetic factors influencing their coat color. Grey horses have a higher incidence of developing these tumors, especially as they age, which can significantly affect their overall health and longevity.

While larger horses may have different care requirements and some could potentially have shorter lifespans due to physical stress, this does not specifically relate to the connection between coat color and health. Additionally, the amount of pasture they require or the quantity of hay they consume does not directly correlate with the lifespan or health issues associated with grey horses. The heightened risk of melanomas in grey horses remains the primary reason for their generally shorter lifespan compared to other colors or breeds.