Cushing's Symptoms in Dogs: Recognition, Diagnosis & Treatment Guide
Learn to recognize Cushing's symptoms in dogs, understand diagnostic tests, treatment costs, and prognosis. A veterinary-informed guide for dog owners.
If your dog is drinking excessively, gaining weight around the midsection, and losing hair in symmetrical patches, you may be noticing Cushing's symptoms in dogs — a hormonal disorder that affects an estimated 1 to 2 out of every 1,000 dogs annually. Also known as hyperadrenocorticism, Cushing's disease occurs when a dog's body produces too much cortisol, the stress hormone that regulates metabolism, immune response, and blood pressure. Left untreated, it can lead to diabetes, kidney damage, and life-threatening complications. The good news? With proper veterinary diagnosis and management, most dogs with Cushing's disease live comfortably for years after diagnosis.
What Is Cushing's Disease in Dogs?
Cushing's disease (hyperadrenocorticism) is a condition in which the adrenal glands overproduce cortisol. Cortisol is essential in small, regulated amounts — it helps your dog respond to stress, maintain blood sugar, and reduce inflammation. But chronically elevated cortisol levels essentially put the body in a constant state of metabolic overdrive, breaking down muscle tissue, suppressing the immune system, and disrupting normal organ function.
There are three forms of Cushing's disease in dogs, each with different underlying causes:
| Type | Cause | Frequency |
|---|---|---|
| Pituitary-Dependent (PDH) | A benign tumor on the pituitary gland signals the adrenal glands to overproduce cortisol | 80–85% of cases |
| Adrenal-Dependent (ADH) | A tumor on one or both adrenal glands directly produces excess cortisol | 15–20% of cases |
| Iatrogenic | Caused by prolonged use of corticosteroid medications (prednisone, dexamethasone) | Varies; linked to long-term steroid therapy |
PDH is by far the most common form. According to the Merck Veterinary Manual, pituitary tumors causing PDH are typically small, slow-growing adenomas (benign tumors), though in rare cases — roughly 10–20% of PDH dogs — a larger "macrotumor" can develop and cause neurological symptoms.
Recognizing Cushing's Symptoms in Dogs: A Severity-Based Checklist
Cushing's disease is notoriously gradual in onset. Many owners don't notice symptoms until the disease is well-established because changes happen over weeks and months. Here's what to watch for, organized from early warning signs to advanced clinical presentation:
| Severity Level | Symptoms | What's Happening |
|---|---|---|
| Early Warning Signs (Often overlooked) |
• Increased thirst (polydipsia) — drinking noticeably more water • Increased urination (polyuria) — needing more walks, accidents in house • Increased appetite (polyphagia) — begging, scavenging more than usual • Mild panting, even at rest |
Excess cortisol disrupts kidney concentration ability and drives hunger signals |
| Progressing Symptoms (Visible physical changes) |
• Pot-bellied or "barrel" abdomen • Muscle wasting, especially along the spine and hind legs • Bilateral symmetrical hair loss (alopecia) — usually on flanks, sparing head and legs • Thin, fragile skin that bruises easily • Recurring skin infections or slow wound healing |
Cortisol breaks down protein (muscle and skin collagen), weakens immune defenses |
| Advanced / Severe Symptoms |
• Calcium deposits in the skin (calcinosis cutis) — hard, gritty patches • Lethargy and exercise intolerance • Recurrent urinary tract infections • Elevated blood pressure • Neurological signs (with macrotumors): head pressing, circling, seizures, disorientation |
Multi-system organ stress; macrotumor compressing brain tissue |
Risk Factors: Which Dogs Are Most Likely to Develop Cushing's Disease?
- Age: Most commonly diagnosed in dogs aged 7–12 years; rare in dogs under 6
- Breed predisposition: Poodles (especially Miniature and Toy), Dachshunds, Yorkshire Terriers, German Shepherds, Boston Terriers, Beagles, and Cocker Spaniels show higher incidence rates
- Sex: Females are slightly more prone to PDH; adrenal tumors show no strong sex bias
- Size: Small to medium breeds are overrepresented for PDH; larger breeds are slightly more represented in adrenal tumors
- Steroid history: Any dog on long-term corticosteroid therapy (for allergies, autoimmune disease, or cancer treatment) is at risk for iatrogenic Cushing's
It's worth noting that while these breeds are statistically overrepresented, Cushing's disease can affect any dog. The American Kennel Club highlights that the genetic component appears complex — no single gene has been identified, but familial clustering in certain breed lines suggests heritable susceptibility.
How Veterinarians Diagnose Cushing's Disease
Diagnosing Cushing's disease is one of the more complex workups in veterinary endocrinology. There's no single test that provides a definitive answer — instead, your veterinarian will follow a staged diagnostic process to confirm excess cortisol production and then determine the type.
Stage 1: Initial Screening (Baseline Blood Work & Urinalysis)
Your vet starts with a complete blood count (CBC), chemistry panel, and urinalysis. While these don't diagnose Cushing's directly, they often reveal characteristic patterns: elevated alkaline phosphatase (ALP), elevated cholesterol, dilute urine, and sometimes elevated blood sugar. These findings raise suspicion and justify moving to specific hormonal testing.
Estimated cost: $150–$300
Stage 2: Confirmatory Hormonal Testing
Two primary tests confirm Cushing's disease:
| Test | How It Works | Accuracy | Cost Range |
|---|---|---|---|
| Low-Dose Dexamethasone Suppression Test (LDDST) | Blood drawn at baseline, then synthetic steroid (dexamethasone) is injected. Blood re-drawn at 4 and 8 hours. In healthy dogs, dexamethasone suppresses cortisol; in Cushing's dogs, cortisol stays elevated. | ~95% sensitivity for diagnosing Cushing's; also helps differentiate PDH from ADH in some cases | $200–$400 |
| ACTH Stimulation Test | Baseline blood draw, then synthetic ACTH hormone is injected to stimulate adrenal glands. Blood re-drawn at 1 hour. Exaggerated cortisol response suggests Cushing's. | ~80–85% sensitivity for PDH; higher for ADH. Also used to monitor treatment response. | $150–$350 |
| Urine Cortisol:Creatinine Ratio (UCCR) | A single free-catch urine sample measures cortisol relative to creatinine. Best used as a screening "rule-out" test — a normal result makes Cushing's very unlikely. | High sensitivity (~95%) but low specificity — many non-Cushing's conditions elevate it | $50–$100 |
Stage 3: Differentiating PDH from ADH
Once Cushing's is confirmed, your vet needs to determine the type, because treatment differs significantly. This may involve:
- High-Dose Dexamethasone Suppression Test (HDDST): At high doses, dexamethasone suppresses cortisol in PDH dogs but not in ADH dogs — though this test has limitations and is used less frequently now.
- Endogenous ACTH measurement: Blood levels of ACTH are high in PDH (pituitary is over-stimulating) and low in ADH (adrenal tumor is producing cortisol independently, suppressing pituitary ACTH). This test requires careful sample handling (frozen plasma shipped overnight) and costs $150–$250.
- Abdominal ultrasound: Visualizes the adrenal glands directly. In PDH, both adrenals appear normal or slightly enlarged. In ADH, one adrenal is typically enlarged (tumor) while the other is shrunken (atrophied from suppressed ACTH). Also screens for liver changes and other abdominal abnormalities. Cost: $300–$600
In cases where a pituitary macrotumor is suspected (neurological symptoms present), an MRI of the brain may be recommended. This is typically performed at a specialty center and costs $1,500–$3,000.
Treatment Options for Cushing's Disease
Treatment depends on the type of Cushing's disease and the individual dog's health status. Here's a comprehensive comparison of available options:
| Treatment | Used For | How It Works | Success Rate | Monthly Cost |
|---|---|---|---|---|
| Trilostane (Vetoryl®) | PDH and ADH — first-line treatment | Inhibits an enzyme (3β-HSD) needed for cortisol synthesis in the adrenal glands. Given orally once or twice daily with food. | ~85% of dogs show clinical improvement within 2–4 weeks | $40–$150/month depending on dog's weight and dose (typical starting dose: 1–3 mg/kg twice daily) |
| Mitotane (Lysodren®) | PDH — older treatment, still used | Selectively destroys the cortisol-producing layer of the adrenal cortex. Requires an initial "loading" phase with daily dosing, then maintenance 1–2 times weekly. | ~80% response rate; higher risk of adverse effects (Addisonian crisis in 2–5% of cases) | $30–$80/month (drug is less expensive but requires closer monitoring) |
| Adrenalectomy (Surgical Removal) | ADH — when adrenal tumor is unilateral and no metastasis is present | Surgical removal of the affected adrenal gland. Performed by a board-certified veterinary surgeon. Dog requires temporary cortisol supplementation post-op. | ~70–80% long-term cure rate for benign tumors; perioperative mortality ~5–10% | $3,000–$7,000 one-time surgical cost; may eliminate need for lifelong medication |
| Radiation Therapy | PDH with pituitary macrotumor causing neurological signs | Targeted radiation to shrink the pituitary tumor. Typically 10–20 fractions over several weeks. Combined with trilostane for cortisol control. | Improves neurological symptoms in ~75% of cases; does not always normalize cortisol | $4,000–$8,000 total course |
| Gradual Steroid Taper | Iatrogenic Cushing's | Slowly reducing the dose of the causative corticosteroid medication under veterinary supervision. Never stop steroids abruptly — this can trigger an Addisonian crisis. | Often fully reversible over weeks to months once steroids are withdrawn | Minimal — primarily monitoring costs |
Monitoring Protocol for Medical Treatment (Trilostane/Mitotane):
Both medications require careful monitoring to avoid over-suppression of cortisol (which causes Addison's disease — a life-threatening condition). The standard protocol is:
- ACTH stimulation test at 10–14 days after starting medication
- Recheck at 30 days
- Recheck at 90 days
- Then every 3–6 months for the dog's lifetime
Each monitoring visit typically includes an ACTH stim test and chemistry panel, costing $150–$350 per visit. This means ongoing monitoring adds roughly $400–$1,000 per year to your total cost.
Prognosis and Life Expectancy with Cushing's Disease
The prognosis for Cushing's disease varies significantly depending on the type, stage at diagnosis, and presence of complications:
| Scenario | Expected Survival | Key Factors |
|---|---|---|
| PDH, well-managed with trilostane | 2–2.5 years average after diagnosis; many dogs live 3–5+ years | Consistent medication, regular monitoring, no macrotumor development |
| PDH with pituitary macrotumor | 6 months to 2 years depending on tumor size and neurological involvement | Tumor growth rate, response to radiation, severity of neurological signs |
| ADH, benign tumor, surgically removed | Normal life expectancy possible — potential cure | Successful surgery, no metastasis, adequate post-operative care |
| ADH, malignant tumor (adrenal carcinoma) | 6–12 months typically; surgery may extend this | Metastasis at diagnosis (often to liver or lungs), vascular invasion |
| Iatrogenic Cushing's | Normal life expectancy once steroids are properly tapered | Underlying condition that required steroids; gradual withdrawal protocol |
| Untreated Cushing's disease | 6 months to 2 years with declining quality of life | Risk of diabetes, kidney failure, congestive heart failure, pulmonary thromboembolism |
According to studies published in the Journal of Veterinary Internal Medicine, dogs with PDH treated with trilostane have a median survival time of approximately 662 to 900 days (roughly 2 to 2.5 years) from diagnosis. However, many dogs live well beyond this average, particularly those diagnosed early and monitored consistently.
Home Care and Daily Management
Living with a Cushing's dog requires consistent daily routines and vigilant observation. Here's what effective home management looks like:
Medication Administration
- Give trilostane with food — absorption increases significantly with a meal, and consistency matters. Feed the same type and amount of food at medication time.
- Administer at the same time(s) every day. Set phone alarms if needed — missed doses destabilize cortisol levels.
- Never double a dose if you miss one. Give the next scheduled dose as normal and note the missed dose for your vet.
- Store trilostane capsules in their original container, away from moisture and light. Handle with gloves if you're pregnant or trying to conceive — trilostane can be absorbed through the skin and is a known teratogen.
Monitoring at Home
- Water intake: Continue tracking daily consumption. Decreased thirst is one of the first signs that treatment is working — most owners notice improvement within 2–4 weeks.
- Appetite: Note any changes. Persistent ravenous hunger may indicate under-dosing; loss of appetite can signal over-dosing (cortisol dropping too low).
- Energy level and mobility: Track activity. Improved stamina and reduced panting are positive indicators.
- Skin and coat: Hair regrowth can take 3–6 months after cortisol is controlled. Photograph your dog monthly to track changes objectively.
- Watch for Addisonian signs: Lethargy, vomiting, diarrhea, weakness, collapse, or refusal to eat can indicate cortisol has dropped dangerously low. This is an emergency — contact your vet immediately and bring your dog in. Your vet may instruct you to skip the next trilostane dose.
Lifestyle Adjustments
- Maintain a consistent feeding schedule with a balanced, complete diet. Dogs with Cushing's are prone to elevated blood lipids, so a diet moderate in fat (with your vet's guidance) may be beneficial.
- Provide easy access to water at all times — never restrict water, even if your dog is drinking and urinating excessively. The increased thirst is driven by the disease, not behavioral.
- Plan for more frequent bathroom breaks. Consider a dog door, indoor potty pads, or a midday walker if you work long hours.
- Keep skin clean and dry — Cushing's dogs are prone to bacterial and yeast skin infections. Bathe with a veterinarian-recommended medicated shampoo (chlorhexidine-based or ketoconazole-based) if your vet identifies a skin infection.
- Avoid stressful situations where possible — stress triggers additional cortisol release, compounding the disease's effects.
The True Cost of Cushing's Disease Treatment
Cushing's disease is a chronic condition, and costs accumulate over the dog's lifetime with the disease. Here's a realistic financial breakdown:
| Expense Category | First Year | Each Subsequent Year |
|---|---|---|
| Diagnostic workup (blood work, LDDST/ACTH stim, ultrasound) | $800–$2,000 | — |
| Trilostane medication (varies by dog weight) | $500–$1,800 | $500–$1,800 |
| Monitoring visits (ACTH stim + blood work) | $600–$1,400 (4–5 visits in year 1) | $300–$700 (2 visits/year) |
| Treatment of complications (UTI, skin infections) | $100–$500 | $100–$400 |
| Estimated Annual Total | $2,000–$5,700 | $900–$2,900 |
Over a typical 2–3 year survival period with treatment, total expenditure commonly falls between $4,000 and $12,000. Pet insurance that covers chronic/endocrine conditions can significantly offset these costs, but only if enrolled before diagnosis — Cushing's is typically excluded as a pre-existing condition after diagnosis. If you have pet insurance, check whether endocrine disorders are covered and what the annual/lifetime caps are.
When to See the Vet: Red Flag Symptoms
- Sudden lethargy, weakness, or collapse — may indicate an Addisonian crisis (cortisol has dropped dangerously low from over-treatment). This is a life-threatening emergency.
- Vomiting and diarrhea that persists more than 12 hours — especially combined with decreased appetite or weakness.
- Neurological signs: head pressing against walls, circling, seizures, sudden blindness, or disorientation — may indicate pituitary macrotumor growth.
- Rapid, labored breathing or sudden difficulty breathing — Cushing's dogs are at elevated risk for pulmonary thromboembolism (blood clots in the lungs).
- Sudden increase in thirst/urination beyond baseline — may indicate developing diabetes mellitus (a common comorbidity).
- Abdominal distension that worsens rapidly — could indicate organ enlargement or fluid accumulation.
For after-hours emergencies, contact your nearest emergency veterinary hospital. If you suspect your dog has ingested a toxic substance, call the ASPCA Animal Poison Control Center at (888) 426-4435 (24/7, consultation fee applies) or the Pet Poison Helpline at (855) 764-7661.
For non-emergency symptoms that still warrant a prompt veterinary appointment (within 1–2 weeks):
- Gradually increasing thirst and urination over several days to weeks
- Symmetrical hair loss on the body (flanks, back) that doesn't itch
- Noticeable increase in appetite combined with weight gain in the abdomen
- Recurring skin infections or wounds that heal unusually slowly
- New or worsening panting at rest
Prevention and Early Detection Strategies
Unfortunately, naturally occurring Cushing's disease (PDH and ADH) cannot be prevented — the pituitary and adrenal tumors develop without known modifiable risk factors. However, you can take steps to reduce risk and catch the disease early:
- Avoid unnecessary long-term steroid use: If your dog is prescribed corticosteroids for allergies, arthritis, or other conditions, discuss steroid-sparing alternatives with your vet (such as oclacitinib/Apoquel® for allergic dermatitis, or cyclosporine/Atopica® for immune-mediated conditions). When steroids are necessary, use the lowest effective dose for the shortest duration.
- Annual senior wellness blood work: For dogs over 7 years old, annual blood panels can catch early biochemical changes (elevated ALP, elevated cholesterol) that may precede obvious clinical symptoms by months.
- Monitor water intake proactively: Don't wait for obvious symptoms. If you notice your dog's water bowl is emptying faster than usual, start tracking and consult your vet.
- Know your breed's risk: If you own a predisposed breed (Poodle, Dachshund, Yorkshire Terrier, German Shepherd, Boston Terrier), maintain heightened awareness of the symptom checklist above.
Frequently Asked Questions About Cushing's Disease in Dogs
Can Cushing's disease in dogs be cured?
In most cases (PDH), Cushing's disease is managed rather than cured. Trilostane and mitotane control cortisol production but don't eliminate the underlying pituitary tumor. Dogs typically require lifelong medication and monitoring. The exception is ADH caused by a benign adrenal tumor — surgical removal (adrenalectomy) can be curative in approximately 70–80% of these cases. Iatrogenic Cushing's is also potentially fully reversible with proper steroid tapering.
What happens if Cushing's disease in dogs goes untreated?
Untreated Cushing's disease progressively worsens. Excess cortisol damages multiple organ systems over time, leading to complications including diabetes mellitus (approximately 10–20% of untreated Cushing's dogs develop concurrent diabetes), hypertension, kidney damage, congestive heart failure, pulmonary thromboembolism (blood clots), and severe skin infections. Quality of life declines steadily, and most untreated dogs survive 6 months to 2 years after symptoms become pronounced.
Is Cushing's disease painful for dogs?
Cushing's disease itself is not typically painful in the way an injury or cancer might be. However, the secondary effects can cause significant discomfort: muscle weakness makes movement difficult, skin infections are itchy and irritating, a distended abdomen can feel uncomfortable, and calcinosis cutis (calcium deposits in the skin) can be painful. Neurological symptoms from macrotumors may cause headaches or disorientation. Most owners report that their dog seems "off" or "not themselves" rather than overtly in pain.
Can I give my dog natural supplements for Cushing's disease?
Some supplements — such as melatonin, lignans (from flaxseed), and phosphatidylserine — have been explored in veterinary literature for mild cortisol modulation. However, none have demonstrated sufficient efficacy to replace medical treatment in confirmed Cushing's disease. Never substitute prescribed medication with supplements without your veterinarian's explicit guidance. Some supplements can interact with trilostane or mitotane, altering their effectiveness or causing adverse effects.
How quickly will I see improvement after starting treatment?
Most owners notice decreased thirst and urination within 1–4 weeks of starting trilostane. Appetite normalization follows shortly after. Hair regrowth takes considerably longer — typically 3–6 months, and in some cases the coat may not fully return to its pre-disease appearance. Muscle tone and abdominal shape improve gradually over 2–4 months as cortisol levels stabilize and protein metabolism normalizes.
Which breeds are most prone to Cushing's disease?
The breeds with the highest reported incidence include Miniature and Toy Poodles, Dachshunds, Yorkshire Terriers, German Shepherds, Boston Terriers, Beagles, and Cocker Spaniels. However, any breed can develop Cushing's disease, and mixed-breed dogs are also affected. The strongest risk factor is age — dogs over 7 years old are significantly more likely to develop the condition regardless of breed.
Understanding Cushing's symptoms in dogs and acting on them early makes a meaningful difference in your dog's quality of life and long-term prognosis. If you recognize several of the signs described above, schedule a veterinary appointment — the diagnostic process is straightforward once initiated, and modern treatment options are effective for the vast majority of dogs.
Aaron Whyte
All our authors care for dogs every day — read more of their work on the authors page.
