Symptoms of Cushing's in Dogs: Early Warning Signs & Treatment Guide

What Is Cushing's Disease in Dogs?

Cushing's disease, medically known as hyperadrenocorticism, is a hormonal disorder caused by chronic overproduction of cortisol — the body's primary stress hormone. In a healthy dog, the pituitary gland signals the adrenal glands to release cortisol in controlled amounts. When this system malfunctions, cortisol floods the body, triggering a cascade of metabolic, immune, and physical changes that can be life-threatening if left untreated.

There are three forms of Cushing's in dogs:

• Pituitary-dependent hyperadrenocorticism (PDH): Caused by a benign tumor on the pituitary gland. Accounts for approximately 80–85% of all canine Cushing's cases.
• Adrenal-dependent hyperadrenocorticism (ADH): Caused by a tumor on one or both adrenal glands. Represents roughly 15–20% of cases.
• Iatrogenic Cushing's: Caused by prolonged administration of corticosteroid medications (prednisone, dexamethasone) for conditions like allergies or autoimmune disease.

Cushing's is most commonly diagnosed in middle-aged to senior dogs, typically between 7 and 12 years old. According to the Merck Veterinary Manual, it is one of the most frequently diagnosed endocrine disorders in dogs, with certain small breeds showing significantly higher prevalence.

Recognizing the Symptoms of Cushing's in Dogs

The symptoms of Cushing's disease develop gradually — often over months or even years — which is why many owners don't notice changes until the disease is advanced. Cortisol affects nearly every organ system, so signs can appear across multiple body systems simultaneously.

Early Warning Signs (Often Missed)

These subtle symptoms are easy to attribute to "just getting older," but they warrant veterinary attention if two or more appear together:

Severity	Symptom	What You'll Notice	Why It Happens
Early	Increased thirst (polydipsia)	Drinking more than 100 mL/kg/day; emptying water bowls rapidly	Cortisol interferes with kidney's ability to concentrate urine
Early	Increased urination (polyuria)	More frequent outdoor breaks; accidents in house-trained dogs	Excess water intake leads to excess urine production
Early	Increased appetite (polyphagia)	Begging constantly, counter-surfing, eating non-food items	Cortisol disrupts normal hunger regulation
Early	Mild lethargy	Less interest in walks or play; more sleeping	Muscle protein breakdown reduces stamina
Early	Recurrent skin infections	Hot spots, bacterial or yeast infections that keep returning	Immunosuppressive effects of excess cortisol
Advanced	Pot-bellied appearance	Distended abdomen despite weight loss elsewhere on body	Abdominal fat redistribution + weakened abdominal muscles + enlarged liver
Advanced	Bilateral hair loss (alopecia)	Symmetrical thinning on flanks, abdomen, and thighs; head and legs typically spared	Cortisol suppresses hair follicle activity
Advanced	Muscle wasting	Visible spine and hip bones; thin legs with a round body	Cortisol causes protein catabolism in skeletal muscle
Advanced	Thin, fragile skin	Skin tears easily; slow wound healing; visible blood vessels	Cortisol inhibits collagen production and skin cell turnover
Advanced	Panting without exertion	Heavy breathing at rest, especially at night	Muscle weakness affects respiratory muscles; possible pulmonary thromboembolism
Advanced	Calcinosis cutis	Hard, gritty, plaque-like patches on the skin (often along the back)	Cortisol causes calcium deposits in the skin
Advanced	Neurological signs (macrotumor)	Disorientation, head pressing, seizures, pacing	Large pituitary tumor (>10 mm) compresses brain tissue

Important: No single symptom confirms Cushing's disease. Many of these signs overlap with diabetes, hypothyroidism, kidney disease, and liver disease. Only your veterinarian can diagnose Cushing's through specific diagnostic testing.

How Is Cushing's Disease Diagnosed in Dogs?

Diagnosing Cushing's is a multi-step process because cortisol levels naturally fluctuate throughout the day and can be elevated by stress alone. Your veterinarian will typically follow a staged approach, starting with screening tests and progressing to confirmatory tests.

The total diagnostic workup for Cushing's disease typically costs between $800 and $2,500, depending on how many tests are needed and whether advanced imaging is required. According to the Veterinary Information Network (VIN), the LDDST combined with abdominal ultrasound is considered the gold standard for differentiating PDH from ADH.

Treatment Options for Cushing's Disease

Whether Cushing's can be cured depends on the underlying cause. Pituitary-dependent Cushing's is generally managed (not cured) with lifelong medication, while adrenal tumors may be surgically curable. Iatrogenic Cushing's resolves with gradual tapering of the offending steroid.

Treatment	Type	How It Works	Success Rate	Monthly Cost (2026)	Key Considerations
Trilostane (Vetoryl®)	Medical (first-line)	Inhibits cortisol synthesis in the adrenal glands	85–93% clinical improvement	$50–$150 (size-dependent)	FDA-approved for dogs. Requires twice-daily dosing with food. ACTH stim tests at 10 days, 30 days, 90 days, then every 3–6 months. Risk of hypoadrenocorticism if overdosed.
Mitotane (Lysodren®)	Medical (second-line)	Selectively destroys the cortisol-producing layer of the adrenal cortex	80–85% clinical improvement	$30–$100	Off-label use in dogs. Loading phase (daily for 5–10 days) followed by maintenance (2–3×/week). Higher risk of adverse reactions including Addisonian crisis. Less commonly used since trilostane approval.
Adrenalectomy	Surgical	Removal of the affected adrenal gland	~70–80% survival to discharge; potential cure	$3,000–$7,000 (one-time)	For ADH only. Requires board-certified surgeon. Risk of hemorrhage, pulmonary thromboembolism, and hypoadrenocorticism post-op. Dog needs temporary cortisol supplementation during recovery.
Pituitary Radiation	Medical/Specialist	Targets pituitary tumor with focused radiation to reduce size and hormone output	Variable; symptom improvement in 50–75% within 12 months	$4,000–$8,000 (one-time course)	For PDH macrotumors (>10 mm). Requires referral to veterinary oncologist. Multiple sessions over 3–4 weeks. Cortisol levels may take 6–18 months to normalize.
Steroid Tapering	Supportive	Gradual dose reduction of exogenous corticosteroids	High (full resolution if no permanent adrenal changes)	$0–$50 (vet monitoring)	For iatrogenic Cushing's only. Must taper slowly over weeks to months to avoid Addisonian crisis. Never stop steroids abruptly.

Supportive Care Alongside Treatment

Regardless of the primary treatment, most dogs with Cushing's benefit from:

• Prescription diet: Moderate-protein, low-fat diets help manage weight and reduce liver strain. Brands like Hill's Prescription Diet w/d or Royal Canin Veterinary Diet Gastrointestinal Low Fat are commonly recommended.
• Urinary tract monitoring: Dogs with Cushing's are prone to UTIs due to dilute urine and immunosuppression. Quarterly urine cultures are recommended even without symptoms, as infections can be "silent" (no obvious signs).
• Blood pressure monitoring: Hypertension occurs in up to 30–50% of Cushing's dogs and requires separate management with amlodipine or other antihypertensives.
• Thromboembolism prevention: Cushing's increases blood clotting risk. Your vet may recommend low-dose aspirin or other antiplatelet therapy.

Prognosis and Life Expectancy

The prognosis for dogs with Cushing's disease varies significantly depending on the type, stage at diagnosis, and whether complications are present.

Scenario	Median Survival Time	Key Factors
PDH treated with trilostane (no macrotumor)	2–2.5 years (many live 3–5+ years with good management)	Most common scenario. Consistent medication and monitoring are critical.
PDH with pituitary macrotumor (>10 mm)	6–12 months without radiation; up to 2+ years with radiation	Neurological signs worsen prognosis. Tumor growth rate varies.
ADH — benign adrenal tumor, surgically removed	Potential cure; normal lifespan if surgery successful	Surgical mortality ~20–30%. Dogs surviving the perioperative period have excellent outcomes.
ADH — malignant adrenal tumor	6–18 months	Depends on metastasis. Vascular invasion common. Surgery may not be possible.
Untreated Cushing's	Variable; often 1–2 years from symptom onset	Death usually from complications: thromboembolism, kidney failure, diabetes, or ruptured adrenal tumor.

According to research published in the Journal of the American Veterinary Medical Association, dogs with PDH treated with trilostane who achieve good cortisol control within the first 6 months have significantly longer survival times than those who do not.

Home Care and Daily Management

Living with a dog who has Cushing's requires a structured routine. Here is what day-to-day management looks like for most owners:

Daily Requirements

• Medication administration: Trilostane must be given with food, ideally twice daily at consistent 12-hour intervals. Set phone alarms — missed doses cause cortisol levels to rebound.
• Water access: Never restrict water. Increased thirst is a symptom, and restricting water can cause dangerous dehydration. Keep multiple water stations available.
• Frequent bathroom breaks: Plan for 5–8 outdoor trips per day, including overnight access to a potty area. Consider a doggy door or indoor pee pads for overnight management.
• Skin care: Check skin daily for new infections, calcinosis cutis lesions, or wounds that aren't healing. Use a gentle, veterinary-recommended shampoo (chlorhexidine-based for recurrent bacterial infections).
• Weight tracking: Weigh your dog weekly on the same scale. Rapid weight changes can indicate cortisol levels are out of control.

Monitoring Schedule

• ACTH stimulation test: At 10 days, 30 days, 90 days after starting trilostane, then every 3–6 months
• Blood pressure check: Every 3–6 months
• Urine culture: Every 3 months (even if asymptomatic)
• Complete blood work: Every 6 months to monitor liver and kidney function
• Abdominal ultrasound: Annually, or sooner if symptoms change

What to Watch for Between Vet Visits

Keep a symptom journal. Note any return of excessive drinking, new skin lesions, changes in appetite, or behavioral shifts. Bring this log to every appointment — it helps your vet fine-tune medication dosages.

How Much Does Cushing's Disease Treatment Cost?

Cushing's is a chronic condition, and costs accumulate over the dog's remaining lifespan. Here is a realistic breakdown based on 2026 veterinary pricing in the United States:

• Initial diagnostic workup: $800–$2,500 (blood work, LDDST, ACTH stim, ultrasound)
• Trilostane medication: $50–$150/month depending on dog size (30 mg capsules for small dogs, 120 mg for large dogs)
• ACTH stimulation tests: $200–$400 each; 3–4 times in the first year, then 2×/year = $400–$1,600/year
• Routine blood work and urine cultures: $150–$300 per visit; 2–4×/year = $300–$1,200/year
• Prescription diet: $60–$120/month
• Adrenal surgery (ADH): $3,000–$7,000 one-time
• Radiation therapy (macrotumor): $4,000–$8,000 one-time
• Emergency Addisonian crisis treatment: $1,500–$4,000 (ICU hospitalization, IV fluids, emergency cortisol)

Estimated first-year total cost: $2,500–$5,500 for medically managed PDH. Ongoing annual cost: $1,500–$3,500 per year for medication, monitoring, and food. Pet insurance that covers endocrine conditions can significantly offset these expenses, though many plans exclude pre-existing conditions.

When to See the Vet Immediately

Non-Emergency — Schedule an Appointment This Week

• Gradual increase in thirst and urination over several days
• New patches of hair loss or skin darkening
• Noticeable increase in belly size
• Recurrent skin or ear infections
• Panting more than usual at rest

Can Cushing's Disease Be Prevented?

Unfortunately, naturally occurring Cushing's disease (PDH and ADH) cannot be prevented — it is caused by tumors that develop spontaneously. However, you can reduce risk and catch the disease early:

• Minimize unnecessary steroid use: If your dog has allergies, discuss non-steroidal alternatives with your vet (Apoquel®, Cytopoint®, immunotherapy) before resorting to long-term prednisone.
• Annual senior bloodwork: Dogs over age 7 should have yearly blood panels. Elevated ALP is often the first laboratory clue of Cushing's, appearing before obvious symptoms.
• Monitor water intake: Measure how much your dog drinks daily. More than 100 mL per kg of body weight per day (roughly 1.5 cups for a 20-lb dog) is a threshold that warrants investigation.
• Know your breed's risks: If you own a Poodle, Dachshund, Yorkshire Terrier, or other predisposed breed, be especially vigilant about the early symptoms listed above.

Frequently Asked Questions

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. Only a licensed veterinarian can interpret diagnostic tests and prescribe appropriate medication.