Which method helps prevent a grass-kept pony from getting fat?

Using a grazing muzzle is an effective method for preventing a grass-kept pony from gaining excess weight. Grazing muzzles limit the amount of grass a pony can consume while still allowing them to graze, which helps control their calorie intake. This is particularly important for ponies that are prone to obesity or conditions like laminitis, as it allows them to enjoy grazing without the risk of overconsumption.

In contrast, feeding more concentrates would increase calorie intake rather than help manage weight. Increased grazing time could lead to more grass consumption, thereby contributing to weight gain. Feeding only hay might not provide a balanced diet and could lead to nutrient deficiencies if the pony is not receiving enough forage variety. Therefore, using a grazing muzzle effectively balances the pony’s need to graze with the need to manage its weight.