Cushing's Disease in Rabbits: Hyperadrenocorticism Signs and Skin Changes

Cushing's disease means the body is exposed to too much cortisol or other adrenal-related hormone activity over time. In rabbits, this condition is usually called hyperadrenocorticism. It appears to be uncommon compared with dogs, and published rabbit-specific information is limited, so diagnosis often relies on a combination of clinical signs, imaging, and specialized endocrine testing rather than one perfect test.

In rabbits, pet parents often notice the skin first. Affected rabbits may develop progressive hair loss, very thin skin, flaky skin, delayed regrowth after clipping, or skin that tears easily. Some rabbits also show muscle loss, a rounded belly, reduced activity, or recurrent skin problems. These changes can look dramatic even when the rabbit is still eating and acting fairly normal.

Because rabbits can have other conditions that mimic adrenal disease, including parasites, fungal disease, barbering, reproductive disease, poor grooming from pain, or other hormone disorders, your vet will usually work through a list of possibilities before calling it Cushing's disease. That stepwise approach matters, especially in a species where the disease is rare and the evidence base is still developing.

In general, hyperadrenocorticism happens when the adrenal glands produce too much hormone activity over time. In other species, that may be linked to a pituitary problem, an adrenal tumor, adrenal hyperplasia, or long-term steroid exposure. In rabbits, the exact cause in an individual patient is often harder to pin down because the disease is rare and rabbit-specific research is limited.

Your vet may consider adrenal enlargement, adrenal nodules, or other endocrine abnormalities if a rabbit has classic skin changes. Some specialty laboratories even offer a rabbit adrenal hormone panel, which shows that adrenal disease is recognized in exotic practice, but test interpretation still needs clinical context.

It is also important to rule out look-alikes. Hair loss and skin changes in rabbits can come from mites, ringworm, urine scald, obesity that limits grooming, dental pain, arthritis, reproductive disease, or trauma. That is why a careful workup matters before making assumptions about an uncommon endocrine disorder.

Diagnosis usually starts with a rabbit-experienced physical exam and a close look at the pattern of hair loss and skin quality. Your vet may recommend skin testing to rule out parasites or fungal disease, along with baseline bloodwork and urinalysis to look for infection, inflammation, organ changes, or other illnesses that can mimic endocrine disease.

Imaging is often the next step. Abdominal ultrasound can help assess the adrenal glands and look for other internal problems. In more complex cases, advanced imaging such as CT may be discussed, especially if surgery is being considered or ultrasound findings are unclear.

Some rabbits may also need specialized adrenal hormone testing through a referral laboratory. These tests can add useful information, but they are not usually interpreted alone. Your vet will combine the history, exam findings, skin changes, imaging, and lab results to decide whether hyperadrenocorticism is likely and which treatment options make sense for your rabbit.

There is no proven way to prevent spontaneous Cushing's disease in rabbits. Because the condition appears uncommon and may be linked to internal endocrine changes that are not under a pet parent's control, prevention is mostly about early detection and reducing complications.

The most practical step is routine wellness care with a rabbit-savvy veterinarian. Regular exams can help catch subtle coat thinning, weight changes, muscle loss, or skin fragility before they become severe. Good housing, soft bedding, careful handling, and prompt treatment of skin wounds can also reduce secondary injury if your rabbit develops fragile skin.

It also helps to avoid giving steroid medications unless your vet specifically recommends them and has weighed the risks and benefits for rabbits. If your rabbit starts losing fur, develops flaky skin, or seems unusually delicate to the touch, schedule an exam early. Fast attention will not prevent the disease itself, but it can prevent avoidable skin trauma and help your vet build a treatment plan sooner.