Cushing's Disease Dog Symptoms
Learn to recognize Cushing's disease dog symptoms early. Covers diagnosis costs, treatment options, prognosis, and which breeds are most at risk.
What Is Cushing's Disease in Dogs?
Cushing's disease — clinically known as hyperadrenocorticism (HAC) — is an endocrine disorder where a dog's body produces excessive cortisol over a sustained period. Cortisol is a steroid hormone released by the adrenal glands, and while it plays a vital role in stress response, metabolism, and immune function, chronically elevated levels cause widespread damage to organs, skin, muscles, and the immune system.
There are three forms of Cushing's disease in dogs:
- Pituitary-dependent hyperadrenocorticism (PDH): Accounts for roughly 80–85% of cases. A benign tumor on the pituitary gland overproduces ACTH (adrenocorticotropic hormone), which signals the adrenal glands to pump out excess cortisol.
- Adrenal-dependent hyperadrenocorticism (ADH): Approximately 15–20% of cases. A tumor on one of the adrenal glands directly produces excess cortisol. Roughly 50% of adrenal tumors are malignant (adrenocortical carcinoma).
- Iatrogenic Cushing's: Caused by prolonged administration of corticosteroid medications (prednisone, dexamethasone) for allergies, autoimmune conditions, or other diseases. This form is reversible with careful dose tapering.
Cushing's disease is relatively common in middle-aged to older dogs. According to the Merck Veterinary Manual, PDH is most frequently diagnosed in dogs between 7 and 12 years of age. The condition is not immediately life-threatening in most cases, but untreated Cushing's progressively damages the kidneys, liver, cardiovascular system, and immune defenses, making early recognition of Cushing's disease dog symptoms essential for long-term quality of life.
Recognizing Cushing's Disease Dog Symptoms by Severity
The clinical signs of Cushing's disease develop gradually — often over months — which is why many owners attribute early changes to "just getting old." Understanding the progression helps you catch the disease before serious organ damage occurs.
| Severity | Symptom | What You'll Notice |
|---|---|---|
| Early Warning Signs | Increased thirst (polydipsia) | Water bowl empties faster; drinking 100+ mL/kg/day (normal is 40–60 mL/kg/day) |
| Increased urination (polyuria) | More frequent potty breaks; house-trained dogs having accidents indoors | |
| Increased appetite (polyphagia) | Acting hungry constantly; scavenging, begging, or stealing food | |
| Mild panting | Panting more than usual at rest, not just after exercise or in heat | |
| Subtle coat changes | Coat looks duller, thinner, or grows back slowly after grooming/clipping | |
| Advanced Symptoms | Pot-bellied appearance | Abdomen looks distended and rounded due to muscle wasting and fat redistribution; liver enlargement (hepatomegaly) |
| Bilateral symmetric hair loss (alopecia) | Hair thins on flanks, trunk, and abdomen; typically spares the head and legs | |
| Muscle weakness and wasting | Difficulty climbing stairs, jumping into cars; visible thinning of leg and temporal muscles | |
| Thin, fragile skin | Skin bruises easily; wounds heal slowly; visible calcium deposits (calcinosis cutis) appear as hard, gritty patches | |
| Recurrent skin and urinary infections | Frequent hot spots, ear infections, or UTIs due to immune suppression from excess cortisol | |
| Lethargy and reduced activity | Less interest in walks, play, or interaction; sleeping more during the day | |
| Neurological signs (large pituitary tumors) | Head pressing, disorientation, seizures, pacing — indicates a macroadenoma (>10 mm) pressing on brain tissue |
Risk Factors: Who Gets Cushing's Disease?
- Age: Most commonly diagnosed in dogs 7–12 years old; rare under age 6.
- Breed predisposition (PDH): Poodles (especially Miniature and Toy), Dachshunds, Beagles, Boston Terriers, Yorkshire Terriers, Boxers, and Cocker Spaniels carry higher risk.
- Breed predisposition (ADH — adrenal tumors): Larger breeds (>20 kg / 44 lb) are somewhat more likely to develop adrenal-dependent Cushing's.
- Sex: Female dogs are slightly overrepresented in PDH cases; no strong sex predilection for ADH.
- Weight: Obesity is not a direct cause but can mask early symptoms and complicate diagnosis.
- Medication history: Dogs on long-term corticosteroids for allergies, arthritis, or autoimmune conditions are at risk for iatrogenic Cushing's.
How Is Cushing's Disease Diagnosed in Dogs?
Diagnosing Cushing's disease is one of the more complex endocrine workups in veterinary medicine. No single test is definitive on its own — your veterinarian will use a combination of screening tests and imaging to confirm the diagnosis and determine whether the cause is pituitary or adrenal. Here's what the diagnostic process typically looks like:
Step-by-Step Diagnostic Process
- Clinical suspicion — Your vet notes characteristic symptoms (PU/PD, potbelly, alopecia) during an exam and reviews your dog's history.
- Baseline blood work and urinalysis — A complete blood count (CBC), serum biochemistry panel, and urinalysis look for supporting evidence: elevated alkaline phosphatase (ALP), elevated ALT, high cholesterol, stress leukogram, and dilute urine (low specific gravity). Cost: $150–$300.
- Low-dose dexamethasone suppression test (LDDST) — The primary screening test. Blood cortisol is measured at baseline, then at 4 and 8 hours after a small dexamethasone injection. In a healthy dog, cortisol suppresses; in a Cushing's dog, it does not. Cost: $200–$400. Requires a full day at the clinic (8-hour blood draws).
- ACTH stimulation test — Measures adrenal reserve. Cortisol is measured before and 1 hour after synthetic ACTH injection. This test has ~80–85% sensitivity for PDH and ~60% for ADH. It's also used to monitor treatment response. Cost: $150–$350. (Note: ACTH (cosyntropin) supply shortages have occurred; your vet may use alternative protocols.)
- High-dose dexamethasone suppression test (HDDST) — Helps differentiate PDH from ADH. In PDH, high-dose dexamethasone partially suppresses cortisol; in ADH, it does not. Cost: $200–$350.
- Abdominal ultrasound — Visualizes the adrenal glands. Symmetrically enlarged adrenals suggest PDH; one enlarged and one atrophied adrenal suggests ADH. Also screens for other abdominal disease. Cost: $300–$600.
- Endogenous ACTH level — High ACTH indicates PDH; low/undetectable ACTH indicates ADH. This blood sample must be handled carefully (frozen and shipped to a reference lab). Cost: $100–$200.
- Advanced imaging (CT or MRI) — Recommended if neurological signs are present or if surgical removal of an adrenal tumor is planned. Brain MRI evaluates pituitary tumor size; abdominal CT maps adrenal tumor invasion. Cost: $1,500–$3,500.
Total diagnostic costs for a full Cushing's workup typically range from $800 to $2,500 depending on which tests are needed and whether advanced imaging is included. According to the American Kennel Club's veterinary resources, some general practice clinics can complete the initial screening (LDDST + ultrasound) for under $1,000, while referral to a veterinary internal medicine specialist may increase total costs.
Treatment Options for Cushing's Disease
Can Cushing's disease in dogs be cured? The answer depends on the type. Iatrogenic Cushing's is curable by tapering the causative medication. Adrenal tumors may be surgically curable if benign and fully resectable. Pituitary-dependent Cushing's is generally managed (not cured) with lifelong medication — but most dogs live well with treatment.
| Treatment | Best For | How It Works | Success Rate | Monthly Cost |
|---|---|---|---|---|
| Trilostane (Vetoryl®) | PDH and ADH (first-line medical therapy) | Inhibits 3β-hydroxysteroid dehydrogenase, blocking cortisol synthesis in the adrenal glands | ~85–90% clinical improvement; symptoms improve within 2–4 weeks | $40–$120/month (varies by dog size and dose) |
| Mitotane (Lysodren®) | PDH (older first-line, now second-line behind trilostane) | Selectively destroys the cortisol-producing zona fasciculata of the adrenal cortex | ~80–85% clinical improvement; requires careful loading and monitoring | $30–$80/month |
| Adrenalectomy (surgical removal) | ADH — benign adrenal adenomas | Removes the cortisol-producing tumor entirely | Curative in ~75–85% of benign cases; perioperative mortality 5–10% | $3,000–$7,000 one-time (surgery + hospitalization) |
| Radiation therapy | Large pituitary macroadenomas causing neurological signs | Shrinks the pituitary tumor to relieve brain compression | Improves neurological signs in ~75% of cases; does not always resolve hormonal excess | $4,000–$8,000 total course |
| Steroid taper (iatrogenic) | Iatrogenic Cushing's from exogenous corticosteroid use | Gradually reducing the causative steroid allows adrenal glands to recover normal function | Fully reversible in most cases over 2–6 months | Minimal (tapering existing medication) |
Important monitoring note: Dogs on trilostane or mitotane require regular ACTH stimulation tests to ensure cortisol levels are controlled but not suppressed too low. Over-suppression causes Addisonian crisis (hypoadrenocorticism), a life-threatening emergency. Expect monitoring bloodwork every 3–6 months once stabilized, at $150–$350 per visit.
Prognosis and Life Expectancy for Dogs with Cushing's Disease
What is the life expectancy of a dog with Cushing's disease? With appropriate treatment and monitoring, most dogs with pituitary-dependent Cushing's live a near-normal lifespan. The prognosis varies significantly based on the form and stage of the disease at diagnosis.
| Condition | Median Survival Time (Treated) | Key Prognostic Factors |
|---|---|---|
| PDH — microadenoma (<10 mm) | 2–2.5 years average; many live 3–5+ years | Response to trilostane, owner compliance with monitoring, age at diagnosis, comorbidities (diabetes, pancreatitis) |
| PDH — macroadenoma (>10 mm) | 1–2 years (varies widely) | Tumor growth rate, presence of neurological signs, response to radiation therapy |
| ADH — benign adenoma (surgically removed) | 3–4+ years; potentially curative | Complete surgical resection, absence of metastasis, perioperative complications |
| ADH — malignant carcinoma | 12–18 months (with surgery); 6–12 months (without) | Vascular invasion, metastasis to liver/lungs, tumor size at diagnosis |
| Iatrogenic Cushing's | Normal life expectancy after recovery | Duration of steroid use, underlying condition requiring steroids, adrenal recovery speed |
Without treatment, Cushing's disease is not immediately fatal but progressively reduces quality of life. Untreated dogs face increasing risk of diabetes mellitus, pancreatitis, kidney disease, hypertension, pulmonary thromboembolism (blood clots in the lungs), and severe infections due to chronic immune suppression. Median survival for untreated Cushing's is estimated at approximately 1–2 years from symptom onset, though some dogs decline more rapidly.
Home Care and Daily Management
Managing a dog with Cushing's disease at home requires consistency and attentiveness. Here's what daily and long-term care looks like:
Daily Requirements
- Medication administration: Trilostane is typically given once or twice daily with food. Consistency in timing matters — set a phone alarm if needed. Never skip doses without veterinary guidance.
- Water access: Increased thirst will persist during early treatment and gradually improve. Always provide fresh water and don't restrict intake — dehydration is dangerous.
- Potty schedule: Expect continued frequent urination for the first 4–8 weeks of treatment. Add an extra potty break to your routine to prevent accidents.
- Appetite monitoring: Polyphagia usually decreases within 2–4 weeks of effective treatment. If ravenous hunger persists beyond a month, your dog's dose may need adjustment.
Ongoing Monitoring
- ACTH stimulation tests: At 10–14 days after starting trilostane, then at 30 days, 90 days, and every 3–6 months thereafter. Your vet adjusts dosage based on post-ACTH cortisol levels (target: 2–7 µg/dL for trilostane).
- Blood pressure checks: Hypertension is a common comorbidity. Check blood pressure at least every 6 months.
- Urinalysis: Monitor for UTIs (which may be asymptomatic due to immune suppression). Culture at least every 3–6 months.
- Watch for Addisonian crisis signs: Lethargy, vomiting, diarrhea, collapse, loss of appetite — these indicate over-suppression of cortisol and require immediate veterinary attention. Keep your vet's emergency number accessible.
Lifestyle Adjustments
- Skin and coat care: Use gentle, oatmeal-based shampoos. Hair may regrow slowly (3–6 months) after treatment begins. Avoid clipping the coat short until hormonal levels are controlled.
- Exercise: Maintain regular, moderate exercise to help rebuild muscle mass. Start with short walks and gradually increase as strength returns.
- Diet: Feed a balanced, moderate-fat diet. Dogs with concurrent pancreatitis or diabetes may need a prescription diet — consult your veterinarian for specific recommendations.
Cost Breakdown: Diagnosis and Long-Term Treatment
Budgeting for Cushing's disease requires understanding both upfront and ongoing expenses. Here's a realistic cost breakdown based on 2025–2026 US veterinary pricing:
- Initial diagnostic workup: $800–$2,500 (screening tests, bloodwork, ultrasound)
- Advanced imaging (CT/MRI): $1,500–$3,500 (if needed for tumor localization)
- Monthly medication (trilostane): $40–$120/month depending on dose and dog size
- Monitoring bloodwork: $150–$350 per visit, 3–5 visits in year one, then 2 visits per year
- Adrenal surgery (if ADH): $3,000–$7,000 one-time
- Radiation therapy (if macroadenoma): $4,000–$8,000 total
- Emergency Addisonian crisis treatment: $500–$2,000 (IV fluids, dexamethasone, hospitalization)
Realistically, expect to spend $1,500–$3,000 in the first year (diagnosis + medication + monitoring) and $800–$1,500 per year for ongoing management. Pet insurance can offset significant costs — many comprehensive plans cover Cushing's if it's not a pre-existing condition. Average monthly premiums for a middle-aged dog range from $35–$75/month depending on coverage level and deductible.
When to See the Vet: Red Flag Symptoms
Call Your Vet Immediately If Your Dog Shows:
- Sudden collapse, extreme lethargy, or inability to stand — possible Addisonian crisis (cortisol too low) or pulmonary thromboembolism
- Vomiting and diarrhea lasting more than 12 hours — especially in a dog on trilostane or mitotane
- Seizures, head pressing, or disorientation — may indicate a growing pituitary macroadenoma
- Rapid, labored breathing or coughing blood — possible pulmonary thromboembolism (blood clot in the lungs), a known complication of Cushing's
- Complete loss of appetite for 24+ hours in a dog previously eating well — could signal Addisonian crisis or pancreatitis
- Excessive thirst and urination that suddenly worsens dramatically — may indicate diabetes mellitus developing as a comorbidity
Do not stop or adjust medication doses without veterinary guidance. Abruptly stopping trilostane or mitotane can cause dangerous cortisol fluctuations.
If your dog is not yet diagnosed but you've noticed several early symptoms — increased thirst, increased urination, increased appetite, and coat thinning — schedule a wellness exam with your veterinarian. Mention the specific changes you've observed and how long they've been present. Early diagnosis means earlier treatment, better symptom control, and lower risk of complications like diabetes or thromboembolism.
Prevention and Early Detection Strategies
There is no way to prevent pituitary or adrenal tumors that cause naturally occurring Cushing's disease. However, you can take steps to reduce risk and catch the disease early:
- Minimize unnecessary corticosteroid use: Work with your veterinarian to explore steroid-sparing alternatives for allergies and inflammation (e.g., oclacitinib/Apoquel®, lokivetmab/Cytopoint®, omega-3 fatty acids). If steroids are necessary, use the lowest effective dose for the shortest duration.
- Senior wellness bloodwork: Annual blood panels starting at age 7 (or age 5 for predisposed breeds) can catch elevated ALP and other early biochemical markers before obvious symptoms appear.
- Track your dog's water intake: Measure how much water your dog drinks daily. A sudden or gradual increase beyond 60 mL/kg/day is one of the earliest reliable indicators.
- Monitor coat and skin changes: Take photos of your dog's coat every few months. Comparing images makes gradual thinning easier to spot.
- Know your breed's risk: If you own a Poodle, Dachshund, Beagle, Boston Terrier, or Yorkshire Terrier, discuss Cushing's screening with your vet during annual exams once your dog reaches age 8.
Frequently Asked Questions About Cushing's Disease in Dogs
Which breeds are most prone to Cushing's disease?
Miniature and Toy Poodles, Dachshunds, Beagles, Boston Terriers, Yorkshire Terriers, Boxers, Cocker Spaniels, and Staffordshire Bull Terriers are among the breeds with the highest reported incidence of pituitary-dependent Cushing's disease. Adrenal tumors are seen more often in larger breeds over 20 kg (44 lb). However, any breed can develop Cushing's, especially in the 7–12 year age range.
Is Cushing's disease painful for dogs?
Cushing's itself is not typically painful in the way a fracture or tumor pressing on a nerve would be. However, the secondary effects — muscle weakness, recurrent skin infections, urinary tract infections, and joint stress from weight redistribution — can cause discomfort. Many owners report their dogs seem noticeably "perkier" and more comfortable within weeks of starting treatment.
Can I treat my dog's Cushing's disease with natural supplements?
There is no scientifically validated natural or holistic treatment that reliably controls Cushing's disease. Some supplements (melatonin, lignans from flaxseed) are marketed for adrenal support, but peer-reviewed evidence for their efficacy is limited to absent. Relying on supplements instead of proven medications allows the disease to progress and increases complication risk. Always consult your veterinarian before adding supplements, as some can interact with trilostane or mitotane.
Will my dog's hair grow back after treatment?
In most cases, yes — but slowly. Hair regrowth typically begins 3–6 months after cortisol levels are controlled. Some dogs' coats return fully; others may have permanently thinner or slightly different-textured fur. Calcinosis cutis (calcium deposits in the skin) usually resolves over 6–12 months of treatment.
What happens if Cushing's disease goes untreated?
Without treatment, excess cortisol progressively damages multiple organ systems. Dogs develop increasing susceptibility to infections, diabetes mellitus (approximately 20% of untreated Cushing's dogs develop concurrent diabetes), hypertension, kidney dysfunction, and blood clotting disorders. Quality of life declines steadily, and median survival without treatment is approximately 1–2 years from diagnosis, though the timeline varies. With treatment, most dogs maintain good quality of life for 2–5 years or longer.
How often does my dog need bloodwork once stabilized on medication?
After the initial titration period (bloodwork at 2 weeks, 4 weeks, and 12 weeks), most veterinarians recommend ACTH stimulation testing every 3–6 months for life. Additional bloodwork may be needed if symptoms recur or if your dog's weight changes significantly (dose adjustments are weight-based).
This article is for informational purposes only and does not replace professional veterinary advice. If you suspect your dog has Cushing's disease, consult your veterinarian for proper diagnosis and treatment. For more information on canine endocrine disorders, visit the American Veterinary Medical Association or the Merck Veterinary Manual.
Dr. Hannah Wickes
All our authors care for dogs every day — read more of their work on the authors page.
