CONDITION

Steroid Hepatopathy

Steroid hepatopathy describes a pattern of change in the liver that occurs in response to sustained high levels of corticosteroid hormones—either from the body's own overproduction (Cushing's disease) or from medication given for another condition. The liver cells accumulate glycogen, a storage form of glucose, which causes the liver to enlarge and alters the way it functions. Owners often notice increased drinking and urination, sometimes a pot-bellied appearance, or changes in appetite and energy. Blood tests taken for other reasons may show elevated liver enzymes, prompting questions about what is happening and whether the liver is being damaged. The condition itself tends to develop gradually, and the signs can be subtle at first. This page explores what steroid hepatopathy looks like from the outside, what is taking place inside the liver, how the underlying cause is identified, and the range of approaches used depending on whether the source of the corticosteroids is internal or external.

Why this matters now

Steroid hepatopathy tends to appear in middle-aged to older dogs, often around nine years of age or beyond, though it can develop at any age when corticosteroid medication is used. Certain terrier breeds, including Scottish Terriers, may carry a higher risk of developing the pattern. The condition arises either from long-term medication for another illness—such as allergic skin disease, immune-mediated conditions, or inflammatory disorders—or from the body's own overproduction of cortisol in cases of hyperadrenocorticism (Cushing's syndrome).

The changes in the liver develop gradually over weeks to months of sustained corticosteroid exposure, whether from medication or internal hormone production. Early on, enzyme elevations may appear on blood tests before any outward signs are noticed. As glycogen continues to accumulate within liver cells, the organ may enlarge and other metabolic effects of excess corticosteroid become more apparent. The pattern can reverse if the source of corticosteroid is reduced or removed, though the timeline varies between individuals and depends on the underlying cause.

Signals & patterns

Early signals

Increased thirst and urination

The dog may drink more water than usual and need to urinate more frequently, sometimes asking to go outside during the night or having accidents indoors. This happens because corticosteroids alter how the kidneys handle water and can reduce the effect of the hormone that normally concentrates urine.

Changes in appetite

Many dogs develop a stronger interest in food, appearing persistently hungry or begging more than before. This increase in appetite is a direct metabolic effect of elevated corticosteroid levels on the brain's hunger signals.

Subtle weight gain or redistribution

The dog may gain weight despite no change in diet, or the weight may shift toward the abdomen whilst muscle mass over the limbs and spine appears reduced. This reflects corticosteroid effects on fat storage and protein metabolism.

Increased panting

Panting may occur more often, even when the dog is resting or in cool environments. The mechanism is not fully understood but appears related to metabolic and respiratory changes under sustained corticosteroid influence.

Coat changes

The coat may become thinner, duller, or slower to regrow after clipping, and some dogs develop symmetrical hair loss along the flanks or body. Corticosteroids affect the hair growth cycle and the skin's ability to maintain a healthy coat.

Later signals

Pot-bellied appearance

The abdomen may become noticeably distended and pendulous, giving a characteristic rounded shape. This results from a combination of enlarged liver, weakened abdominal muscles, and redistribution of fat under corticosteroid influence.

Skin fragility and bruising

The skin may become noticeably thin, almost translucent, and prone to tearing or bruising with minor trauma. In some cases, hard nodules or areas of mineralisation may develop in the skin, a change called calcinosis cutis.

Muscle wasting

Muscle mass over the shoulders, hips, and skull may visibly diminish, giving the dog a more angular appearance despite overall weight gain. Corticosteroids promote protein breakdown in muscle tissue whilst sparing fat deposits.

Reduced activity or lethargy

The dog may seem less interested in walks, tire more easily, or spend more time resting. This can reflect muscle weakness, metabolic shifts, or the cumulative effects of the underlying condition driving the corticosteroid excess.

Click to read about the biological mechanisms

How this is usually investigated

Investigation typically begins with a careful history—particularly any current or recent corticosteroid medication, and signs such as increased thirst, changes in appetite, or weight redistribution. Blood tests often provide the first clue, with characteristic patterns of enzyme elevation appearing during routine screening or investigation of another concern. Further steps depend on whether the corticosteroid exposure is known or suspected to be internal, and may include imaging to assess liver size and structure, and hormone testing to distinguish between medication-related and endogenous causes.

Blood biochemistry

Purpose: Measures liver enzymes—particularly alkaline phosphatase, which tends to be markedly elevated in steroid hepatopathy—alongside alanine aminotransferase, bile acids, and other markers of liver function. The pattern can suggest glycogen accumulation rather than inflammatory or destructive liver disease.
Considerations: Elevated enzymes indicate change in the liver but do not confirm the cause; many conditions can raise alkaline phosphatase, and the degree of elevation does not always correspond to the severity of liver dysfunction. Additional tests are usually needed to distinguish steroid hepatopathy from other patterns.

Abdominal ultrasound

Purpose: Allows visualisation of liver size, shape, and internal architecture, and can reveal the generalised enlargement and increased echogenicity—brightness on the image—that often accompanies glycogen accumulation. It can also identify masses in the adrenal glands if endogenous hormone production is suspected.
Considerations: Ultrasound findings are suggestive rather than diagnostic on their own; the bright, swollen liver appearance can overlap with other storage diseases or infiltrative conditions. The quality of the examination depends on the experience of the operator and the cooperation of the dog.

Endocrine testing

Purpose: If medication is not the cause, the ACTH stimulation test confirms whether the adrenal glands are producing excess cortisol and is especially useful for identifying steroid (iatrogenic) hepatopathy caused by medication and for monitoring trilostane or mitotane treatment, but on its own it does not reliably distinguish pituitary-dependent disease from an adrenal tumour. Differentiating between the two usually relies on the high-dose dexamethasone suppression test, measurement of endogenous ACTH, or abdominal imaging to look for an adrenal mass or asymmetry.
Considerations: Endocrine tests require careful timing and handling of samples, and results can be affected by stress, concurrent illness, or other medications. No single test is definitive in all cases, and occasionally more than one approach is needed to clarify the picture.

Liver biopsy

Purpose: Provides a direct view of liver tissue under the microscope, allowing confirmation of glycogen accumulation and exclusion of other causes such as inflammation, fibrosis, or copper storage. Biopsy is most useful when the diagnosis remains uncertain after less invasive steps.
Considerations: Biopsy requires anaesthesia and carries a small risk of bleeding or complications, so it tends to be reserved for cases where the diagnosis is unclear or when there is concern about concurrent liver disease. The sample obtained represents only a small portion of the organ.

Radiography

Purpose: Plain X-rays can show generalised liver enlargement and may reveal other changes associated with long-term corticosteroid exposure, such as a distended (enlarged) urinary bladder or calcification of soft tissues.
Considerations: Radiography is less detailed than ultrasound for assessing internal liver structure and does not allow distinction between different causes of hepatomegaly. It is often used as an initial survey but usually prompts further imaging if liver enlargement is noted.

Options & trade-offs

Management depends on the underlying cause—whether the corticosteroids are being given as medication or produced in excess by the body—and on the degree of liver change and concurrent signs. In many cases, a combination of approaches is used, tailored to the individual dog and what the household can sustain over time. The aim is to reduce or remove the hormonal signal driving glycogen accumulation whilst supporting the liver's capacity to recover, though the timeline and completeness of reversal vary between individuals.

Gradual withdrawal or dose reduction of corticosteroid medication

If the dog is receiving corticosteroids for another condition—such as immune-mediated disease or chronic inflammation—the dose may be tapered carefully to the lowest level that controls the original problem, or alternative medications may be considered. Withdrawal is typically done in steps over weeks to months to avoid flare-up of the underlying condition or adrenal insufficiency. The liver often begins to recover once the hormonal exposure diminishes, though the speed and extent depend on how long the changes have been present.

Trade-offs: Reducing or stopping corticosteroids may allow the original condition to resurface, and some dogs cannot tolerate lower doses without relapse. The process requires close monitoring and may involve trial and adjustment to find a sustainable balance.

Medical management of endogenous cortisol excess

When the body itself is producing too much cortisol—usually due to a pituitary tumour or adrenal growth—trilostane — the only medication licensed for this purpose in the UK — can be used to suppress hormone production, while mitotane, which instead destroys overactive adrenal tissue, is not UK-licensed and is now rarely used there, reserved mainly for cases that do not respond to trilostane and sourced off-licence. Treatment is typically lifelong and requires regular monitoring of hormone levels, electrolytes, and clinical signs to adjust the dose and avoid under- or over-suppression. Liver enzymes and size often improve as cortisol levels normalise, though the timeline can be prolonged.

Trade-offs: These medications carry risks of adrenal insufficiency if the dose is too high, and response varies between individuals; some dogs require frequent dose adjustments in the early months. Cost, availability, and the need for ongoing blood tests can be limiting factors for some households.

Surgical removal of adrenal tumours

If imaging reveals a single adrenal tumour producing excess cortisol, surgical removal may be considered, particularly if the tumour is not invading surrounding structures and the dog is otherwise well. Success depends on the tumour's size, location, and whether it has spread, and the procedure carries surgical risks given the proximity of major blood vessels. When successful, hormone levels normalise and the liver changes can reverse over the following months.

Trade-offs: Adrenal surgery is technically demanding and not available at all practices; it carries risks of bleeding, anaesthetic complications, and transient electrolyte disturbance. Some tumours are not amenable to surgery, and occasionally both adrenal glands are affected, complicating the decision.

Supportive care and monitoring

In dogs where the underlying cause cannot be fully addressed—perhaps due to concurrent illness, limited tolerance of medication, or household constraints—the focus may shift to monitoring liver function over time and managing any secondary effects such as increased thirst or urinary accidents. Blood tests at intervals help track whether the changes are stable or progressing, and adjustments to diet, exercise, or environment can support quality of life.

Trade-offs: This approach does not reverse the liver changes and may allow gradual progression if the hormonal exposure continues. It suits situations where more active intervention carries greater risk or is not feasible, but requires acceptance of ongoing change.

Dietary modification and hepatic support

Some diets are formulated to support liver function by providing easily digestible protein, antioxidants, and reduced levels of certain nutrients that can accumulate when liver metabolism is altered. Supplements such as S-adenosylmethionine or vitamin E are sometimes used, though evidence for benefit in steroid hepatopathy specifically is limited. These measures are typically used alongside other approaches rather than in isolation.

Trade-offs: Dietary changes and supplements are generally well tolerated but do not address the underlying hormonal cause and may have modest impact on liver enzyme levels or glycogen accumulation. They can be a useful adjunct when more direct interventions are in place or when options are otherwise limited.

Common misconceptions

Misconception:

"Elevated liver enzymes always mean the liver is failing or severely damaged."

Reality:

In steroid hepatopathy, the enzyme elevation—particularly of alkaline phosphatase—reflects altered metabolism and leaky cell membranes due to glycogen accumulation rather than widespread destruction of liver tissue. The liver often continues to perform its essential functions reasonably well, and the changes can be reversible if the underlying hormonal cause is addressed. Enzyme levels are a signal of change, not a direct measure of how much liver function remains.

Misconception:

"If the dog seems well and is eating normally, the liver changes do not need attention."

Reality:

Steroid hepatopathy can develop and progress without obvious outward signs, particularly in the earlier stages when the dog's appetite, energy, and behaviour may appear normal. The liver has considerable reserve capacity, and clinical signs often emerge only when changes are advanced or when a secondary problem arises. Monitoring and addressing the underlying cause can prevent progression and reduce the risk of complications over time.

Misconception:

"Stopping corticosteroid medication will reverse the liver changes within days."

Reality:

Recovery of the liver after corticosteroid withdrawal or successful treatment of endogenous hormone excess tends to occur over weeks to months, not days. The speed and completeness of reversal depend on how long the changes have been present, the degree of glycogen accumulation, and whether any secondary fibrosis has developed. Some dogs show substantial improvement whilst others retain residual enzyme elevation or structural change even after the hormonal signal is removed.

Related conditions

Chronic Hepatitis in Dogs

Chronic hepatitis can present with similar patterns of elevated liver enzymes and an enlarged abdomen, though the underlying mechanism involves ongoing inflammation rather than glycogen accumulation. Distinguishing between the two often requires consideration of steroid exposure history and, in some cases, liver biopsy.

Hepatic Lipidosis in Dogs

Hepatic lipidosis involves accumulation of fat within liver cells rather than glycogen, but both conditions can develop secondarily in response to hormonal or metabolic disturbances and may show overlapping patterns of liver enzyme elevation on blood work.

Atypical Cushings in Dogs

Atypical Cushing's involves excess production of adrenal sex hormones rather than cortisol, and can share some clinical signs with steroid hepatopathy—such as changes in thirst, appetite, and weight distribution—though liver changes in atypical Cushing's tend to be less prominent.

Diabetes Insipidus

Diabetes insipidus can present with increased thirst and urination similar to what may be observed when steroid hepatopathy occurs alongside or as a result of Cushing's disease, though the underlying mechanisms—loss of urine concentration versus cortisol excess—are distinct.

Liver Disease in Dogs

Steroid hepatopathy is one specific pattern within the broader category of liver disease in dogs, and both may be identified through elevated liver enzymes on routine blood work, though steroid hepatopathy is distinguished by its hormonal cause and reversible nature when corticosteroid exposure is addressed.

If your dog has been diagnosed with steroid hepatopathy, understanding whether the cause is medication-related or arising from the body's own hormone production can help frame what management paths are open and what timeline to expect. The broader context of metabolic health—including how the adrenal glands, liver, and other systems interact—may be useful background as you consider options. Conversations about monitoring intervals, adjustment of medication, and what changes to watch for at home can help clarify the practical shape of care over the coming months.