Medical Conditions:
* Colic: This is a serious condition involving pain in the abdomen. Shivering can be a sign of pain, and lack of appetite is common.
* Dental Problems: Tooth pain or abscesses can cause a horse to stop eating and may lead to shivering from discomfort.
* Parasites: Internal parasites can cause malnutrition, weakness, and shivering.
* Infections: Respiratory infections, for example, can cause fever, shivering, and decreased appetite.
* Metabolic Disorders: Conditions like Cushing's disease or Equine Metabolic Syndrome can lead to weight loss, muscle wasting, and shivering.
* Toxins: Ingesting poisonous plants or other toxins can cause a variety of symptoms, including shivering and loss of appetite.
* Shock: This is a serious condition where the body is not getting enough blood flow. Shivering and lack of appetite are possible signs.
* Pain: Any injury or condition causing pain can lead to shivering and refusal to eat.
Environmental Factors:
* Cold Temperature: While horses are generally hardy, prolonged exposure to cold temperatures can cause them to shiver. If they're not eating, it might be due to discomfort or a lack of energy to do so.
* Stress: Any stressful situation, like a change in environment or a new horse in the herd, can lead to decreased appetite and shivering.
What to Do:
* Call your veterinarian immediately. This is essential for getting a proper diagnosis and treatment.
* Observe your horse closely: Note the severity of shivering, any other symptoms (like coughing, diarrhea, or lethargy), and the horse's behavior. This information will help your vet determine the underlying issue.
* Keep your horse warm and comfortable: If it's cold, provide shelter or blankets.
* Offer water: Dehydration can worsen the situation.
It's important to understand that this is not an exhaustive list. Only a qualified veterinarian can properly diagnose the reason for your horse's symptoms and recommend the appropriate treatment.