Some potential causes of these symptoms include:
- Dehydration: Rabbits can become dehydrated for several reasons, such as not drinking enough water, diarrhea, or vomiting. Dehydration can lead to a loss of appetite, weight loss, and sunken eyes.
- GI stasis: Gastrointestinal stasis is a condition in which the movement of food through the digestive tract slows down or stops. This can be caused by several factors, including stress, changes in diet, or blockages in the digestive tract. GI stasis can lead to weight loss, anorexia, and abdominal pain.
- Kidney disease: Kidney disease can cause a variety of symptoms, including weight loss, decreased appetite, increased thirst, and brown urine.
- Liver disease: Liver disease can also cause a variety of symptoms, including weight loss, anorexia, jaundice (yellowing of the skin and eyes), and brown urine.
- Dental problems: Dental problems can cause rabbits to have difficulty eating, leading to weight loss and anorexia.
- Infectious diseases: Some infectious diseases, such as Pasteurella multocida and Encephalitozoon cuniculi, can cause weight loss, anorexia, and other symptoms.
- Cancer: Some types of cancer can cause weight loss, anorexia, and other symptoms.
It is essential to have your rabbit evaluated by a veterinarian to determine the cause of these symptoms and receive appropriate treatment. The veterinarian will likely perform a physical examination, blood tests, and other diagnostic tests to make a diagnosis. Treatment may involve administering fluids, medications, or surgery.