What is a common sign of thrush in a horse's hoof?

Thrush is a bacterial infection that primarily affects the frog and surrounding areas of a horse's hoof. A common sign of this condition is a foul odor emanating from the affected hoof. This odor is typically a result of decay and the presence of bacteria, which thrive in moist, unhygienic conditions often seen in thrush.

While dryness, swelling, and heat can indicate other hoof issues or conditions, they are not specific indicators of thrush. For example, dryness could suggest a lack of moisture or care in hoof management, swelling might indicate an injury or another type of infection, and heat may signal laminitis or another inflammatory condition. However, the distinct foul odor associated with thrush is a key characteristic that helps in identifying this particular ailment in horses.