Metabolic Bone Disease in Spotted Quolls

What is it?

Metabolic bone disease, also known as nutritional osteodystrophy, is a disorder affecting the bones of spotted quolls when they receive an unbalanced diet in captivity. This Australian carnivorous marsupial, often kept in zoos or conservation centres, has specific nutritional requirements for calcium and phosphorus that, if not met, lead to progressive weakening of the skeleton. It is a preventable disease directly linked to the care provided to the animal.

Commonly observed signs

These signs are neither exhaustive nor specific. Only a veterinarian can establish a diagnosis.

Causes and risk factors

The disease results from a prolonged imbalance between calcium and phosphorus in the diet, most often due to a diet composed almost entirely of muscle meat without bones or offal, which is very low in calcium and high in phosphorus. This imbalance causes the body to draw calcium from the bones to maintain a stable blood level, progressively weakening the skeleton. Lack of exposure to appropriate lighting can worsen the problem, since vitamin D, necessary for calcium absorption, is partly produced through light exposure.

Quolls kept in captivity on a diet consisting mainly of muscle meat without bones and without mineral supplements, and without adequate light exposure, are at highest risk. Young animals undergoing growth are particularly vulnerable because their calcium requirements are higher. Lack of regular veterinary monitoring in captivity also increases the risk that the disease goes unnoticed until an advanced stage.

Diagnosis and care

Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.

Treatment

Management relies above all on rapid and progressive correction of the diet, under strict veterinary supervision to avoid overly abrupt rebalancing. Calcium supplements may be prescribed, along with vitamin D supplementation if necessary. Rest and limitation of physical activity are essential to prevent fractures during the bone recovery phase. Pain relief treatment may be given if the animal shows signs of discomfort. In cases of fractures, surgical or orthopedic management may be considered depending on severity.

Prevention

Possible complications

Spontaneous fractures or fractures from gentle handling, permanent deformities of the spine, pelvis, or limbs, respiratory difficulties if the rib cage is deformed, chronic pain, inability to feed properly if the jaw is affected, and in advanced cases, death.

When to see a veterinarian

Prognosis

The outlook depends heavily on the stage at which the disease is detected. Caught early with prompt dietary correction, the animal can regain a reasonable quality of life even though some deformities may persist. In advanced cases with multiple fractures or severe deformities of the spine or pelvis, the outlook is guarded and the animal's quality of life may remain compromised long-term.

Frequently asked questions

References

WOAH — Organisation mondiale de la santé animale (ex-OIE)

Content reviewed by the TunisieVet editorial team · Updated 02 September 2026