1. Hot Weather: Horses tend to eat less during hot weather. Heat can affect a horse's appetite, and they may feel less inclined to eat their usual amount of food, leading to weight loss.
2. Increased Energy Expenditure: Horses use more energy to stay cool in hot weather. This increased energy expenditure contributes to weight loss as the body burns more calories.
3. Dehydration: Horses may drink less water during hot weather, leading to dehydration. Dehydration can affect the body's metabolism and may indirectly contribute to weight loss.
4. Diet Changes: Some horse owners may switch their horses to a different diet during the summer months, such as providing less hay and more fresh grazing. The change in diet might affect the horse's weight, depending on the nutritional value of the new diet.
5. Parasites: Some parasites, like internal parasites (e.g., worms), may be more prevalent during certain times of the year. Parasite infestations can lead to weight loss as they compete with the horse for nutrients.
6. Stress: Heat and other stressors like flies and insects can cause horses to feel stressed. Chronic stress can affect a horse's overall well-being and may lead to weight loss.