Melena in Rabbits
Melena is a condition in which digested blood is found in the rabbit's fecal contents, making them appear green–black or tarry colored. Though relatively rare in pet rabbits, melena typically occurs as a result of bleeding in the upper digestive tract. It can also result from bleeding that has taken place in the oral cavity or upper respiratory tract. The affected rabbit swallows and digests this blood, which then results in the appearance of the melena.
The following conditions put rabbits at a higher risk for developing melena: unsupervised chewing, stress, and diets high in simple carbohydrates and low in fiber content.
Symptoms and Types
The following are symptoms commonly associated with melena:
- Loose stool
- Tarry or green black stools
- Fecal staining of the skin around the anus
- Anorexia, weight loss
- Teeth grinding
- Abdominal distension
- Stomach ulcers (may be more common in stressed rabbits)
- Paleness of mucous tissues
- Poor haircoat or hair loss
- Gastric tumors
- Gastric ulcers – typically associated with recent stress (disease, surgery, hospitalization, environmental changes)
- Obstruction in the digestive tract - tumors, foreign object
- Metabolic disorders - liver disease, kidney disease
- Swallowing of blood - oropharyngeal, nasal, or sinus lesions (abscess, trauma, neoplasia, aspergillosis)
- Reaction to drugs such as corticosteroids, analgesics
- Bacterial infection
- Clotting disorders (i.e., lack of blood clotting, resulting in excessive bleeding)
Your veterinarian will need to differentiate this occurrence of melena from other types of diseases that can change the consistency and appearance of the stools. Several disagnostic exams will be conducted, including a chemical blood profile, a complete blood count, and a urinalysis -- the results of which may reveal anemia, if a long-standing bleeding disease was present. A detailed examination of the consistency, appearance, and content of the feces will also need to be required.
Other diagnostic tests will include X-rays of the abdomen, which may indicate an intestinal obstruction, mass, foreign body, or fluid in the abdominal cavity. Abdominal ultrasonography may show thickening of the intestinal wall, a gastrointestinal mass, or foreign body. Surgery will be indicated if an object or obstruction appears to be present in the body.
The term for black feces that has blood in it
The digestive tract containing the stomach and intestine
A cavity within a bone; may also indicate a flow or channel
upper respiratory tract
The section of the respiratory system that contains the mouth, nose, pharynx, larynx, trachea, and epiglottis.
An in-depth examination of the properties of urine; used to determine the presence or absence of illness
The whole system involved in digestion from mouth to anus
The process of removing tissue to examine it, usually for medical reasons.
The abdominal wall is a group of bones, muscles, and vital tissues that make up the wall around the organs in the abdomen. Inside these bones, muscles, and tissues is a cavity, and the cavity is what houses the vital organs found inside the abdomen. The abdominal wall is vital for protection of these organs.
A localized infection, usually a lesion filled with pus. Can be large or small in size.
A condition of the blood in which normal red blood cell counts or hemoglobin are lacking.
The end of the gastrointestinal tract; the opening at the end of the tract.
The space in the abdomen that holds the major digestive organs in an animal. Normally referred to as the area between the diaphragm and the pelvis. Also referred to as the peritoneal cavity.