Symptoms, Diagnosis, and Treatment Guide
Guide to adrenal gland disorders in dogs including Cushing's disease and Addison's disease — symptoms, diagnosis costs, treatment options, and prognosis.
Adrenal gland disorders in dogs represent a complex category of endocrine disease that can range from life-threatening emergencies to manageable chronic conditions. The adrenal glands are two small, triangular organs sitting just above each kidney, responsible for producing critical hormones including cortisol, aldosterone, and adrenaline. When these glands malfunction — either producing too much hormone (hyperadrenocorticism, or Cushing's disease) or too little (hypoadrenocorticism, or Addison's disease) — the effects ripple through nearly every body system. According to the Merck Veterinary Manual, Cushing's disease affects approximately 1 to 2 out of every 1,000 dogs annually, making it one of the most common endocrine disorders in middle-aged and older dogs. Addison's disease is rarer, estimated at 0.28% to 0.5% of the general dog population.
Understanding how the adrenal gland in dogs functions — and what happens when it fails — is essential for early detection. Many owners first notice subtle changes: increased thirst, a pot-bellied appearance, unexplained lethargy, or episodes of vomiting and weakness. Because these symptoms overlap with dozens of other conditions, veterinary diagnosis is always required. Never attempt to diagnose or treat an adrenal disorder at home without veterinary confirmation.
What Are the Adrenal Glands and Why Do They Matter?
Each adrenal gland has two functional zones that operate almost as separate organs:
- Adrenal cortex (outer layer): Produces cortisol (regulates metabolism, immune response, and stress), aldosterone (controls sodium and potassium balance), and small amounts of sex hormones.
- Adrenal medulla (inner core): Produces epinephrine (adrenaline) and norepinephrine for the fight-or-flight response.
The adrenal glands operate under a feedback loop with the pituitary gland at the base of the brain. The pituitary releases ACTH (adrenocorticotropic hormone), which signals the adrenal glands to produce cortisol. When cortisol levels rise, the pituitary reduces ACTH output. When this feedback loop breaks down — whether due to a pituitary tumor, an adrenal tumor, or autoimmune destruction of the adrenal cortex — disease results.
Symptoms Checklist: Recognizing Adrenal Gland Disorders Early
Adrenal disease symptoms often develop gradually, which is why many dogs are in advanced stages before owners seek veterinary care. The presentation differs significantly between the two primary disorders.
Cushing's Disease (Excess Cortisol) — Symptom Progression
| Severity Level | Symptoms | Typical Onset |
|---|---|---|
| Early Warning | Increased thirst (polydipsia), increased urination (polyuria), increased appetite, mild panting | Months 1–3 |
| Moderate | Hair loss (symmetrical, bilateral on flanks/trunk), pot-bellied abdomen, thinning skin, muscle wasting along spine and limbs, recurrent skin/ear infections | Months 3–8 |
| Advanced | Calcinosis cutis (hard calcium deposits in skin), severe lethargy, susceptibility to diabetes mellitus, urinary tract infections, hypertension, congestive heart failure, pulmonary thromboembolism (blood clots in lungs) | Months 8+ |
Addison's Disease (Insufficient Cortisol) — Symptom Progression
| Severity Level | Symptoms | Typical Onset |
|---|---|---|
| Early Warning | Intermittent vomiting, mild lethargy, decreased appetite, waxing-and-waning diarrhea, weight loss, shaking/trembling | Variable — often weeks to months of vague illness |
| Addisonian Crisis (Emergency) | Sudden collapse, severe weakness, dehydration, low body temperature, weak pulse, bradycardia (slow heart rate), hypoglycemia, shock | Acute — can develop within hours |
- Your dog collapses or cannot stand
- Severe vomiting or diarrhea with dehydration (tacky gums, skin tenting)
- Heart rate below 60 bpm in a medium/large dog
- Body temperature below 99°F (37.2°C)
- Known Addison's patient misses a DOCP injection or steroid dose
- Sudden onset of extreme thirst and urination (possible Cushing's complication or diabetes onset)
For suspected poisoning or toxic ingestion, call ASPCA Animal Poison Control at (888) 426-4435 (24/7, consultation fee applies).
Risk Factors: Which Dogs Are Most Vulnerable?
Cushing's Disease Risk Profile
- Age: Most commonly diagnosed in dogs 7–12 years old; rare under age 6
- Breed predisposition: Poodles (especially Miniature and Standard), Dachshunds, Boston Terriers, Yorkshire Terriers, Beagles, Boxers, and German Shepherds show elevated incidence
- Sex: Females slightly more predisposed for PDH; no sex predilection for adrenal tumors
- Size: Smaller breeds more commonly affected by PDH; larger breeds more likely to develop adrenal tumors
- Iatrogenic Cushing's: Dogs receiving long-term corticosteroid therapy (prednisone, dexamethasone) for allergies, autoimmune disease, or cancer are at direct risk
Addison's Disease Risk Profile
- Age: Typically diagnosed in young to middle-aged dogs, 4–7 years old
- Breed predisposition: Standard Poodles, Portuguese Water Dogs, Bearded Collies, Nova Scotia Duck Tolling Retrievers, Great Danes, West Highland White Terriers, and Soft-Coated Wheaten Terriers have documented genetic susceptibility
- Sex: Females approximately twice as likely to be affected
- Genetics: Autoimmune destruction of the adrenal cortex accounts for roughly 80% of cases; inherited forms documented in Standard Poodles and Portuguese Water Dogs
- Other causes: Infections (fungal, bacterial), hemorrhage, infiltrative disease, or abrupt withdrawal of long-term steroid medications
Diagnosis Process: What Tests Will Your Vet Run?
Adrenal disorders require a multi-step diagnostic approach. No single blood test can definitively confirm either Cushing's or Addison's disease — your veterinarian will build a case through screening tests followed by confirmatory testing.
Diagnostic Pathway for Suspected Cushing's Disease
- Step 1 — Initial Screening Bloodwork ($80–$200): Complete blood count (CBC), chemistry panel, and urinalysis. Your vet looks for elevated ALP (alkaline phosphatase), elevated ALT, high cholesterol, dilute urine, and possible urinary tract infection. These findings suggest but do not confirm Cushing's.
- Step 2 — Urine Cortisol:Creatinine Ratio ($40–$80): A home-collected first-morning urine sample screens for elevated cortisol excretion. A normal result effectively rules out Cushing's; an elevated result requires further testing.
- Step 3 — Low-Dose Dexamethasone Suppression Test (LDDST) ($150–$300): The gold-standard screening test. Your dog receives a small dexamethasone injection, and blood cortisol is measured at 0, 4, and 8 hours. Failure to suppress cortisol at 8 hours supports a Cushing's diagnosis. This test also differentiates PDH from ADH in roughly 50–60% of cases.
- Step 4 — ACTH Stimulation Test ($120–$250): Less sensitive for PDH (only positive in ~60–65% of cases) but more specific. Useful when iatrogenic Cushing's or an adrenal tumor is suspected. Also the primary confirmatory test for Addison's disease — a blunted cortisol response confirms adrenal insufficiency.
- Step 5 — Abdominal Ultrasound ($300–$600): Visualizes adrenal gland size and shape. Bilaterally enlarged glands suggest PDH; one enlarged and one atrophied gland suggests an adrenal tumor. Also screens for liver changes and other abdominal pathology.
- Step 6 — Advanced Imaging (if adrenal tumor suspected): CT scan ($800–$1,500) or MRI of the brain ($1,200–$2,500) to evaluate tumor size, invasion into nearby blood vessels (especially the caudal vena cava), and surgical feasibility.
Important diagnostic note: The American Kennel Club recommends that dogs being tested for Cushing's should not be under significant stress or illness at the time of testing, as stress alone can elevate cortisol and produce false-positive results. Your vet may want to treat concurrent infections (UTIs, dental disease) before running confirmatory adrenal tests.
Treatment Options: Medical, Surgical, and Supportive Care
Treatment depends entirely on which adrenal disorder is present, whether it's pituitary-dependent or adrenal-dependent, and the individual dog's overall health status. Always consult your veterinarian to determine the appropriate treatment plan for your dog.
| Treatment | Used For | How It Works | Cost Range | Success Rate / Notes |
|---|---|---|---|---|
| Trilostane (Vetoryl®) | PDH and ADH (Cushing's) | Inhibits cortisol synthesis enzyme (3β-HSD); given once or twice daily orally | $60–$180/month depending on dose and dog size | Clinical improvement in 70–85% of dogs within 2–4 weeks; requires lifelong administration and regular monitoring |
| Mitotane (Lysodren®) | PDH (Cushing's); less commonly used now | Selectively destroys adrenal cortex cells; requires careful loading and maintenance phases | $30–$80/month (generic available) | Effective in ~80% of PDH cases; higher risk of Addisonian crisis if overdosed; requires close monitoring |
| Adrenalectomy (surgical removal) | ADH — adrenal tumors (Cushing's) | Removes the affected adrenal gland; may be curative if tumor is benign and hasn't metastasized | $2,500–$6,000 (surgery + hospitalization) | Curative in ~75% of benign adenomas; perioperative mortality 5–10%; malignant carcinomas have guarded prognosis with median survival 7–12 months post-surgery |
| Radiation therapy | Large pituitary macroadenomas causing neurologic signs | Stereotactic radiosurgery or fractionated radiation to shrink pituitary tumor | $3,000–$6,000 | Effective for tumor control in 75–80% of cases; does not immediately resolve cortisol excess; may require concurrent trilostane |
| DOCP (Percorten®-V or Zycortal®) | Addison's disease | Injectable mineralocorticoid replacement; given subcutaneously or intramuscularly every 21–30 days | $100–$300 per injection depending on dog size; Zycortal® approximately $150–$250/vial | Highly effective for mineralocorticoid replacement; most dogs stabilize within 1–2 injections with proper monitoring |
| Fludrocortisone (Florinef®) | Addison's disease (oral alternative to DOCP) | Oral mineralocorticoid given twice daily; also has some glucocorticoid activity | $40–$150/month depending on dose | Effective but requires twice-daily dosing; dose may increase over time; some dogs develop resistance |
| Prednisone (low-dose glucocorticoid) | Addison's disease (supplemental) | Replaces missing cortisol; given daily or during stress events at 2–3x dose | $5–$15/month | Essential companion to DOCP or fludrocortisone; stress dosing critical during illness, travel, or procedures |
Prognosis and Life Expectancy: What to Expect
Prognosis varies significantly based on the specific disorder, the underlying cause, and how early treatment begins. The following table summarizes expected outcomes based on current veterinary literature:
| Condition | Median Survival Time | Quality of Life Outlook |
|---|---|---|
| Pituitary-dependent Cushing's (PDH), treated with trilostane | 2.0–2.5 years from diagnosis (many dogs live 3–5+ years with good management) | Good to excellent once stabilized; symptoms typically improve within 2–8 weeks |
| Adrenal tumor (benign adenoma), surgically removed | Potentially curative; normal life expectancy post-recovery | Excellent if surgery is successful and no complications arise |
| Adrenal tumor (malignant carcinoma) | 7–12 months with surgery; 3–6 months without treatment | Guarded; metastasis to liver and lungs is common |
| Pituitary macroadenoma (large tumor) | 6–18 months depending on neurologic involvement | Fair with radiation; poor if neurologic signs (circling, blindness, seizures) are advanced |
| Addison's disease, well-managed | Normal life expectancy — most dogs die of unrelated causes at typical breed lifespan | Excellent once stabilized; dogs live full, active lives with consistent medication |
| Addisonian crisis (untreated) | Fatal within hours to days without emergency intervention | With aggressive IV fluids and steroid treatment, survival rate exceeds 70% through the initial crisis |
According to studies cited by the American Veterinary Medical Association, the most significant prognostic factor for Cushing's disease is the development of complications — particularly pulmonary thromboembolism, which carries a mortality rate of 40–60% even with treatment. Early diagnosis and consistent medication adherence dramatically improve outcomes for both conditions.
Home Care and Daily Management
Managing an adrenal disorder at home requires consistency, observation, and a partnership with your veterinary team. Here is what daily life looks like for the two primary conditions:
Cushing's Disease — Home Management
- Medication timing: Give trilostane with food at the same time(s) daily. The medication is fat-soluble and absorbs significantly better with a meal containing some fat content.
- Monitor water intake: Track daily water consumption. A normal dog drinks approximately 50–60 mL/kg/day. If your 20 kg (44 lb) dog is drinking more than 1,200 mL (about 5 cups) per day after treatment has started, contact your vet — cortisol may not be adequately controlled.
- Watch for Addisonian signs: Overtreatment with trilostane or mitotane can tip a dog into iatrogenic Addison's disease. Lethargy, vomiting, diarrhea, decreased appetite, and weakness are red flags — stop medication and call your vet immediately.
- Skin care: Hair regrowth may take 3–6 months after cortisol normalizes. Use gentle, oatmeal-based shampoos. Calcinosis cutis lesions may require topical DMSO (prescribed by your vet) to help dissolve calcium deposits.
- Weight management: As muscle tone returns and appetite normalizes, adjust caloric intake to prevent obesity. Target a body condition score (BCS) of 4–5 out of 9.
Addison's Disease — Home Management
- DOCP injection schedule: Mark injection dates on a calendar and set phone reminders. Missing a DOCP dose by even 2–3 days can trigger an Addisonian crisis. Most dogs receive injections every 25 days, but your vet will tailor the interval based on electrolyte monitoring.
- Stress dosing: Double or triple the prednisone dose during known stress events: veterinary visits, boarding, travel, thunderstorms, fireworks, surgery, or illness. Discuss a written stress-dosing protocol with your vet in advance.
- Emergency kit: Keep injectable dexamethasone (prescribed by your vet) at home and learn how to administer it subcutaneously. This can buy critical hours if your dog begins crashing before you reach a clinic.
- Electrolyte monitoring: Blood sodium and potassium levels should be checked at 10–14 days after each dose adjustment, then every 3–6 months once stable. The sodium:potassium ratio should stay above 27:1 (normal is 30:1 to 40:1).
- ID and records: Keep a medical alert tag on your dog's collar noting "Addison's Disease — Requires Steroids." If your dog is hit by a car or found by a stranger, this information could be lifesaving.
Cost of Treatment: Budgeting for Adrenal Disease
Adrenal disorders require a meaningful financial commitment, particularly in the diagnostic phase. Here is a realistic cost breakdown based on 2025–2026 US veterinary pricing:
| Expense Category | Cushing's Disease | Addison's Disease |
|---|---|---|
| Initial diagnostic workup | $600–$1,800 (bloodwork, LDDST, ACTH stim, urinalysis, ultrasound) | $300–$800 (bloodwork, ACTH stimulation test, electrolytes) |
| Emergency crisis treatment | $1,500–$4,000 (if thromboembolism or acute complication) | $1,000–$3,500 (IV fluids, IV dexamethasone, hospitalization 1–3 days) |
| Monthly medication | $60–$200 (trilostane) + monitoring costs | $100–$300 (DOCP) + $5–$15 (prednisone) |
| Monitoring visits (first year) | $400–$800 (ACTH stim tests at 10 days, 30 days, then quarterly; $120–$250 each) | $200–$500 (electrolyte panels at 10–14 days, then every 3–6 months; $60–$120 each) |
| Annual ongoing cost (after first year) | $1,200–$3,500/year | $1,500–$4,000/year |
| Surgical option (if applicable) | $2,500–$6,000 (adrenalectomy) or $3,000–$6,000 (radiation for pituitary tumor) | N/A (medical management is standard) |
Cost-reduction tips: Ask your veterinarian about compounding pharmacies for trilostane, which can reduce monthly costs by 30–50% for larger dogs. For Addison's patients, some owners are trained to administer DOCP injections at home, eliminating office-visit fees for each dose. Pet insurance with a chronic condition rider can significantly offset costs — but only if enrolled before diagnosis, as pre-existing conditions are universally excluded.
Prevention Strategies: What You Can Control
Most adrenal disorders cannot be prevented — pituitary tumors and autoimmune adrenalitis are not caused by owner actions. However, several strategies can reduce risk or catch disease earlier:
- Avoid unnecessary steroid use: Iatrogenic Cushing's disease is entirely preventable. If your dog is prescribed prednisone for allergies, ear infections, or itchy skin, ask your vet about steroid-sparing alternatives such as oclacitinib (Apoquel®), lokivetmab (Cytopoint®), or allergen-specific immunotherapy.
- Never stop steroids abruptly: If your dog has been on prednisone for more than 2–3 weeks, a gradual taper is mandatory. Sudden withdrawal can cause an Addisonian crisis because the adrenal glands have been suppressed and cannot immediately resume cortisol production.
- Breed-specific screening: If you own a Standard Poodle, Portuguese Water Dog, or Nova Scotia Duck Tolling Retriever, ask your breeder about Addison's disease testing. DNA tests for the known genetic markers are available through laboratories such as VetGen and can identify carriers before breeding.
- Senior wellness bloodwork: Annual or biannual chemistry panels starting at age 7 can catch early changes in ALP, ALT, and cholesterol that may prompt Cushing's screening before symptoms become severe.
- Monitor water intake: Keeping a rough log of your dog's daily water consumption is one of the simplest early-detection tools available. A sustained increase of more than 25% above your dog's normal intake warrants a veterinary visit.
Frequently Asked Questions
Can adrenal gland disease in dogs be cured?
It depends on the cause. Benign adrenal tumors (adenomas) causing Cushing's disease can potentially be cured through surgical removal of the affected gland, with the remaining gland eventually resuming normal function. Pituitary-dependent Cushing's disease is not curable but is highly manageable with daily medication — most dogs live comfortably for years. Addison's disease is not curable but is very manageable with lifelong hormone replacement. Dogs with well-controlled Addison's disease have a normal life expectancy.
How much does adrenal disease treatment cost for dogs?
Expect to spend $600–$1,800 on initial diagnostics for Cushing's disease and $300–$800 for Addison's disease. Ongoing annual costs range from $1,200–$3,500 for Cushing's (medication plus monitoring) and $1,500–$4,000 for Addison's (DOCP injections plus electrolyte monitoring). Emergency crisis treatment can add $1,000–$4,000 per episode. Surgical treatment for adrenal tumors adds $2,500–$6,000.
What is the life expectancy of a dog with adrenal gland disease?
Dogs with well-managed pituitary-dependent Cushing's disease have a median survival of 2–2.5 years from diagnosis, with many living 3–5+ years. Dogs with Addison's disease that are consistently medicated typically have a normal lifespan and die of unrelated causes at their breed's typical age. Dogs with malignant adrenal tumors face the shortest survival times, averaging 7–12 months with surgery.
Which dog breeds are most prone to adrenal gland disorders?
For Cushing's disease, the highest-risk breeds include Poodles (Miniature and Standard), Dachshunds, Boston Terriers, Yorkshire Terriers, Beagles, and Boxers. For Addison's disease, Standard Poodles, Portuguese Water Dogs, Bearded Collies, Nova Scotia Duck Tolling Retrievers, and Great Danes have documented genetic predisposition. Both conditions are more common in female dogs.
Can I give my dog natural supplements instead of medication for adrenal disease?
No. There is no scientific evidence that herbal supplements, melatonin, or lignans can replace medical treatment for either Cushing's or Addison's disease. While some supplements (such as melatonin and flaxseed lignans) have been studied for their mild cortisol-lowering effects, they are not sufficient as standalone therapy. Untreated Cushing's disease leads to diabetes, blood clots, and organ damage. Untreated Addison's disease is fatal. Always follow your veterinarian's prescribed treatment plan.
How do I know if my dog's Cushing's medication dose needs adjusting?
Your veterinarian will run an ACTH stimulation test approximately 10–14 days after starting trilostane or changing the dose, then again at 30 days, 90 days, and every 3–6 months thereafter. At home, watch for return of symptoms (excessive drinking/urination, panting, appetite increase) suggesting under-treatment, or signs of lethargy, vomiting, and appetite loss suggesting over-treatment. Both scenarios require a vet visit for dose adjustment.
Is adrenal disease in dogs painful?
Adrenal disorders are not typically painful in the way that arthritis or dental disease is. However, untreated Cushing's disease can cause secondary conditions that are uncomfortable or painful, including recurrent skin infections, urinary tract infections, calcinosis cutis (hardened skin plaques), and muscle weakness that limits mobility. Addisonian crisis causes severe weakness and malaise that is clearly distressing. With proper treatment, most dogs return to comfortable, active lives.
This guide is for informational purposes only and does not replace professional veterinary care. If your dog is showing symptoms of an adrenal disorder, please consult your veterinarian for proper diagnosis and treatment. Every dog's medical situation is unique.
Priya Sutaria
All our authors care for dogs every day — read more of their work on the authors page.
