* Limited Grazing: If the horse doesn't have access to a large enough pasture with good quality grass, they won't get enough to meet their needs.
* Winter or Cold Weather: During winter, grass growth slows down or stops completely, so horses need hay to supplement their diet.
* Poor Quality Grass: If the grass is sparse, overgrazed, or of low nutritional value, horses will still require hay for the necessary nutrients.
* High Workload: Horses that are ridden or worked regularly need more energy and nutrients, which hay can provide.
* Weight Management: Hay is a good source of fiber, which helps keep horses feeling full and can aid in weight management.
* Dental Health: Chewing hay helps keep their teeth healthy and prevents dental problems.
In short, while grass is a good source of nutrition for horses, hay should be considered a crucial part of their diet, especially in certain situations.
It's important to consult with a veterinarian or equine nutritionist to determine the appropriate amount of hay for your horse based on their individual needs.