Cushing's Signs in Dogs: Symptoms, Diagnosis & Treatment Guide
Recognize Cushing's signs in dogs early. Learn symptoms by severity, diagnostic tests, treatment costs, prognosis, and daily management strategies.
What Is Cushing's Disease in Dogs?
Cushing's disease — medically known as hyperadrenocorticism — occurs when a dog's body produces excessive levels of cortisol, the hormone responsible for regulating metabolism, immune response, and stress. In roughly 80–85% of cases, the root cause is a benign tumor on the pituitary gland (pituitary-dependent Cushing's disease, or PDH). The remaining 15–20% stem from tumors on the adrenal glands themselves (adrenal-dependent Cushing's disease, or ADH). A third form, iatrogenic Cushing's, develops when a dog receives prolonged corticosteroid medication for conditions like allergies or autoimmune disease.
According to the Merck Veterinary Manual, Cushing's is one of the most common endocrine disorders in middle-aged and older dogs, with an estimated incidence of 1 to 2 cases per 1,000 dogs annually. It is not immediately life-threatening in most cases, but left untreated, it progressively damages the liver, kidneys, immune system, and cardiovascular health.
If you've noticed your older dog drinking far more water than usual, developing a pot-bellied appearance, or losing patches of fur along their trunk, these are among the most recognizable Cushing's signs in dogs — and they warrant a veterinary endocrinology workup.
Cushing's Signs in Dogs: Symptom Checklist by Severity
Cortisol excess affects nearly every body system, which is why symptoms can appear unrelated. The following checklist organizes Cushing's signs in dogs from early warnings (often subtle and easily missed) to advanced clinical signs that indicate significant disease progression.
| Early Warning Signs | Moderate / Progressive Signs | Advanced / Severe Signs |
|---|---|---|
| Increased thirst (polydipsia) — drinking noticeably more water daily | Pot-bellied or distended abdomen due to muscle wasting and liver enlargement | Severe bilateral hair loss across trunk, sparing head and legs |
| Increased urination (polyuria) — more frequent potty breaks or indoor accidents | Visible muscle wasting, especially along the spine and hindquarters | Recurrent skin infections (bacterial or yeast) that don't resolve |
| Increased appetite (polyphagia) — begging, food-seeking, counter-surfing | Thin, fragile skin that bruises or tears easily | Calcinosis cutis — hard, calcium-encrusted patches on the skin |
| Mild panting more than usual, especially at rest | Symmetric hair thinning or loss on both sides of the body | Lethargy, exercise intolerance, reluctance to walk or play |
| Slightly elevated liver enzymes on routine bloodwork | Recurrent urinary tract infections | Neurological signs (if pituitary macroadenoma): disorientation, head pressing, seizures |
| Mild weight gain despite no diet change | Fat deposits along the neck and shoulders ("buffalo hump") | Hypertension, congestive heart failure signs, or pulmonary thromboembolism |
Why early signs get missed: Increased thirst and appetite are easy to chalk up to warm weather or a dog simply enjoying food. The hallmark trio of polyuria, polydipsia, and polyphagia (the "three P's") is so common in Cushing's that veterinarians consider it a primary diagnostic clue. If your dog is drinking more than 100 mL of water per kilogram of body weight per day (roughly 1.5 ounces per pound), that's clinically significant polydipsia.
Risk Factors: Which Dogs Are Most Susceptible?
Breed Predisposition
According to the American Kennel Club, the following breeds show higher-than-average rates of Cushing's disease:
- Small breeds (PDH-prone): Poodles (all sizes), Dachshunds, Yorkshire Terriers, Boston Terriers, Beagles, Boxers
- Larger breeds (ADH-prone): German Shepherds and larger-breed dogs show slightly elevated risk for adrenal tumors
Age
Most dogs are diagnosed between 7 and 12 years old. The average age at diagnosis is approximately 10–11 years for PDH and 11–12 years for ADH. Cushing's in dogs under 6 is rare and should prompt investigation into atypical causes.
Sex
Females are diagnosed slightly more often than males — approximately 60–65% of PDH cases occur in female dogs, though the reason remains unclear.
Medication History
Dogs on long-term corticosteroid therapy (prednisone, dexamethasone, methylprednisolone) for allergies, immune-mediated disease, or cancer are at risk for iatrogenic Cushing's. Even topical or ear-drop steroid formulations used chronically can contribute.
Weight & Environment
Obesity is not a direct cause but can mask early body-composition changes. Environmental endocrine disruptors are under investigation but not yet confirmed as significant risk factors.
How Veterinarians Diagnose Cushing's Disease
Diagnosing Cushing's is not a single-test process. Because cortisol levels fluctuate throughout the day and in response to stress, your veterinarian will use a staged diagnostic approach. Here is what to expect at each step:
Step 1: Baseline Blood Work and Urinalysis
Your vet will run a complete blood count (CBC), serum biochemistry panel, and urinalysis. Classic findings that raise suspicion include elevated alkaline phosphatase (ALP), elevated ALT, high cholesterol, stress leukogram (high neutrophils, low lymphocytes and eosinophils), and dilute urine (low specific gravity, typically under 1.020). This step alone cannot confirm Cushing's but builds the clinical picture.
Estimated cost: $150–$300 for CBC + chemistry + urinalysis.
Step 2: Confirmatory Endocrine Testing
Two primary tests confirm the diagnosis:
- Low-Dose Dexamethasone Suppression Test (LDDST): Blood is drawn before and at 4 and 8 hours after a small injection of dexamethasone. In a healthy dog, cortisol suppresses; in a Cushing's dog, it does not. This is considered the gold-standard screening test and can also help differentiate PDH from ADH. Cost: $150–$250.
- ACTH Stimulation Test: Blood is drawn before and 1 hour after an injection of synthetic ACTH. An exaggerated cortisol response supports the diagnosis. This test is less sensitive than LDDST for PDH (it misses roughly 20% of PDH cases) but is the preferred test for monitoring treatment response and for iatrogenic Cushing's. Cost: $150–$250.
Step 3: Differentiating PDH from ADH
If Cushing's is confirmed, the next step is determining the type, because treatment differs significantly:
- High-Dose Dexamethasone Suppression Test (HDDST): Helps distinguish pituitary from adrenal origin. Pituitary tumors typically suppress at high doses; adrenal tumors do not.
- Endogenous ACTH levels: High levels suggest PDH; low or undetectable levels suggest ADH.
- Abdominal ultrasound: Visualizes the adrenal glands. Bilateral enlargement suggests PDH; a single enlarged gland with the opposite gland atrophied suggests an adrenal tumor. Cost: $300–$600.
- Brain MRI or CT (if macroadenoma suspected): Recommended if neurological signs are present or if the pituitary tumor may be large (>10 mm). Cost: $1,500–$3,000.
Typical Diagnostic Pathway
- Clinical suspicion → Owner reports Cushing's signs in dogs (PU/PD, polyphagia, hair loss, pot belly)
- Blood work + urinalysis → Elevated ALP, dilute urine, stress leukogram
- LDDST or ACTH stim test → Confirms or rules out hyperadrenocorticism
- HDDST + abdominal ultrasound → Differentiates pituitary-dependent vs. adrenal-dependent
- MRI/CT (if indicated) → Assesses pituitary tumor size for surgical or radiation planning
Total diagnostic cost range: $500–$1,500 for standard workup; up to $3,000–$4,500 if advanced imaging is required.
Treatment Options for Cushing's Disease in Dogs
Treatment depends entirely on the type and severity. Below is a comparison of the primary approaches currently used in veterinary endocrinology.
| Treatment | Used For | How It Works | Success Rate | Cost Range |
|---|---|---|---|---|
| Trilostane (Vetoryl®) | PDH and ADH (first-line medical therapy) | Inhibits cortisol synthesis by blocking the enzyme 3-beta-hydroxysteroid dehydrogenase in the adrenal cortex | Clinical improvement in 85–90% of dogs within 2–4 weeks; normalizes ACTH stim results in ~80% | $40–$120/month depending on dose and dog size (e.g., 30 mg capsules for a 20 lb dog; 60–120 mg for larger dogs) |
| Mitotane (Lysodren®) | PDH (older protocol, still used) | Selectively destroys the zona fasciculata and reticularis of the adrenal cortex, reducing cortisol production | Effective in ~80% of cases; higher risk of adverse effects including Addisonian crisis | $30–$80/month; loading phase requires close monitoring |
| Adrenalectomy (surgical removal) | ADH (benign adrenal tumors) | Removes the affected adrenal gland entirely; if the tumor is benign, this is potentially curative | Survival rate post-surgery: 75–90% for benign tumors; perioperative mortality ~5–10%; recurrence rate ~10–15% | $2,500–$5,500 (surgery, hospitalization, post-op care) |
| Hypophysectomy (pituitary surgery) | PDH (specialized centers only) | Transsphenoidal removal of the pituitary tumor; requires highly specialized surgical expertise | Remission in ~70–85% of cases at experienced centers; limited availability in the US | $5,000–$10,000+ (available at select university hospitals) |
| Radiation therapy | PDH with macroadenoma causing neurological signs | Stereotactic or fractionated radiation shrinks the pituitary tumor over weeks to months | Tumor shrinkage in ~70–80%; neurological improvement in 60–75%; does not normalize cortisol — still requires trilostane | $3,000–$6,000 for a full course |
| Iatrogenic management | Steroid-induced Cushing's | Gradual tapering and discontinuation of exogenous corticosteroids under veterinary supervision | Fully reversible in most cases over 2–6 months after steroid withdrawal | Monitoring visits: $100–$250 per recheck |
Prognosis and Life Expectancy
Prognosis varies significantly based on the type of Cushing's, the presence of comorbidities (co-existing conditions such as diabetes mellitus, which occurs in roughly 10% of Cushing's dogs), and how early the disease is caught.
| Scenario | Median Survival Time | Notes |
|---|---|---|
| PDH treated with trilostane (microadenoma) | 2.0–2.5 years (many live 3–5+ years with good management) | Most common scenario; quality of life typically excellent during treatment |
| PDH with macroadenoma (tumor >10 mm) | 6 months–2 years depending on neurological involvement | Radiation may extend survival; neurological signs worsen prognosis |
| ADH — benign tumor, surgical removal | 18 months–4+ years if surgery is successful | Potentially curative; perioperative period is highest risk |
| ADH — malignant adrenal tumor (adrenocortical carcinoma) | 6–12 months | Tumor invasion into the caudal vena cava worsens prognosis significantly |
| Iatrogenic Cushing's (steroid withdrawal) | Normal life expectancy once resolved | Full recovery expected if underlying steroid-dependent condition can be managed otherwise |
| Untreated Cushing's disease | Variable — months to a few years | Progressive organ damage, immune suppression, risk of pulmonary thromboembolism and pancreatitis |
These figures are medians drawn from veterinary literature, including studies published in the Journal of Veterinary Internal Medicine. Individual outcomes depend heavily on your dog's overall health, age, and how consistently monitoring appointments are kept. Many dogs with well-managed PDH live full, comfortable lives for years after diagnosis.
Home Care, Monitoring & Daily Management
Managing Cushing's at home is a long-term commitment that revolves around medication consistency, observation, and scheduled veterinary monitoring.
Daily Medication Protocol
Trilostane (Vetoryl®) is typically administered once or twice daily with food. The dose is not weight-fixed — it is titrated based on ACTH stimulation test results. Common capsule strengths are 10 mg, 30 mg, 60 mg, and 120 mg. Your vet will start at the low end and adjust upward based on cortisol response.
Monitoring Schedule
After starting or adjusting trilostane, expect the following recheck timeline:
- 10–14 days: First ACTH stim test to check cortisol levels and adjust dose
- 30 days: Second recheck with ACTH stim + electrolytes
- 90 days: Third recheck
- Every 3–6 months thereafter: Ongoing monitoring for life
Each monitoring visit typically costs $150–$350 (exam + ACTH stim test + basic bloodwork). Budget approximately $600–$1,400 annually for monitoring alone once stabilized.
What to Watch at Home
Keep a simple daily log tracking:
- Water intake: Measure how much water your dog drinks per day (fill the bowl with a known amount and measure what remains). Decreasing intake toward normal is one of the first signs treatment is working.
- Appetite: Excessive hunger should diminish within 2–4 weeks of starting trilostane.
- Urination frequency: Note overnight accidents or increased urgency.
- Coat and skin condition: Hair regrowth is slow — expect 3–6 months before visible improvement. Skin infections should be treated concurrently.
- Energy level: Lethargy that worsens or new weakness could indicate over-treatment (Addisonian signs) and requires an immediate vet call.
Lifestyle Adjustments
- Diet: Feed a balanced, moderate-protein, moderate-fat commercial diet that meets AAFCO standards. There is no specific "Cushing's diet," but because these dogs are prone to pancreatitis, avoid high-fat treats and table scraps. A diet with crude fat under 15% on a dry-matter basis is a reasonable target.
- Exercise: Maintain gentle, consistent exercise appropriate for your dog's age and fitness. Avoid strenuous activity if your dog has muscle wasting or joint weakness.
- Potty access: Provide more frequent outdoor breaks, especially during the first weeks of treatment when polyuria may persist. Never punish accidents — this is a medical condition, not a behavioral issue.
- Infection vigilance: Cortisol suppresses the immune system. Watch for recurrent ear infections, skin hot spots, and UTIs. Report any signs promptly.
Cost Breakdown: What to Budget for Cushing's Treatment
Cushing's disease is a chronic condition requiring lifelong management in most cases. Here is a realistic cost breakdown based on 2026 veterinary pricing in the United States:
| Expense Category | Initial (First 3 Months) | Annual Ongoing |
|---|---|---|
| Diagnostic workup (bloodwork, LDDST/ACTH stim, ultrasound) | $500–$1,500 | — |
| Advanced imaging (MRI/CT if needed) | $1,500–$3,000 | — |
| Trilostane (Vetoryl®) medication | $120–$360 | $480–$1,440 |
| Monitoring visits (ACTH stim + bloodwork) | $450–$1,050 (3 visits) | $400–$1,050 (2–3 visits) |
| Concurrent treatment (skin infections, UTIs, etc.) | $100–$400 | $100–$500 |
| TOTAL ESTIMATED COST | $1,170–$6,310 | $980–$2,990/year |
For dogs requiring surgery (adrenalectomy or hypophysectomy), add $2,500–$10,000 as a one-time surgical cost. Pet insurance can offset a significant portion of these expenses if the policy was active before diagnosis — but most plans exclude pre-existing conditions. If your dog is young and healthy, enrolling in insurance now (before any endocrine signs appear) is a financially sound strategy.
When to See the Vet Immediately
🚨 Emergency Red Flags — Call Your Vet or Emergency Clinic Now
Seek immediate veterinary attention if your dog exhibits any of the following:
- Sudden collapse, extreme weakness, or inability to stand — could indicate Addisonian crisis or pulmonary thromboembolism
- Vomiting and diarrhea that won't stop — potential adrenal crisis, especially if your dog is on trilostane or mitotane
- Disorientation, head pressing, circling, or seizures — possible pituitary macroadenoma expansion or neurological complication
- Difficulty breathing or rapid, labored breathing — could signal pulmonary thromboembolism (blood clot in the lungs), a known complication of Cushing's
- Refusal to eat for more than 24 hours while on Cushing's medication — stop the medication and call your vet
- Sudden increase in water consumption beyond already-elevated levels — may indicate worsening disease or diabetes mellitus as a comorbidity
If your dog is on trilostane or mitotane and shows any signs of illness, stop the medication and contact your veterinarian before giving the next dose. Over-suppression of cortisol is dangerous and requires prompt intervention.
For non-emergency situations, schedule a veterinary appointment within the next 1–2 weeks if you notice:
- Gradual increase in thirst and urination over several weeks
- New or worsening hair loss, especially symmetric along the trunk
- Developing pot-bellied appearance in a middle-aged or older dog
- Recurrent skin or urinary tract infections
- Changes in appetite that seem excessive or abnormal
Consult your veterinarian for a proper diagnostic workup before making any assumptions. Many of these symptoms overlap with other conditions including diabetes mellitus, hypothyroidism, kidney disease, and liver disease. Only endocrine testing can confirm or rule out Cushing's disease.
Can Cushing's Disease Be Prevented?
There is no known way to prevent pituitary-dependent or adrenal-dependent Cushing's disease — these arise from spontaneous tumor development with genetic and age-related risk factors. However, you can take steps to reduce risk and improve early detection:
- Minimize unnecessary steroid use: Work with your vet to explore steroid-sparing alternatives for allergies and inflammatory conditions (e.g., oclacitinib/Apoquel®, lokivetmab/Cytopoint®, allergen-specific immunotherapy). If steroids are necessary, use the lowest effective dose for the shortest duration.
- Annual senior bloodwork: For dogs over age 7, annual bloodwork can catch elevated ALP and other early biochemical changes before clinical signs become obvious.
- Know your breed's risk: If you own a Poodle, Dachshund, Yorkie, Boston Terrier, or Beagle, be especially vigilant for the early Cushing's signs in dogs listed above.
- Track water intake: Measuring daily water consumption is one of the simplest at-home screening tools. A sudden or gradual increase in a middle-aged or older dog should always prompt a vet visit.
Frequently Asked Questions
What is Cushing's disease in dogs?
Cushing's disease (hyperadrenocorticism) is an endocrine disorder where the body produces too much cortisol. It is most commonly caused by a benign pituitary gland tumor (80–85% of cases) or, less often, by an adrenal gland tumor. A third form results from prolonged corticosteroid medication use. It primarily affects middle-aged and older dogs and causes symptoms including excessive thirst, urination, appetite, hair loss, and a pot-bellied appearance.
What are the most common symptoms of Cushing's disease in dogs?
The classic signs are the "three P's": polyuria (excessive urination), polydipsia (excessive thirst), and polyphagia (excessive appetite). Other common symptoms include symmetric hair loss on the trunk, a distended or pot-bellied abdomen, thinning skin, muscle wasting, panting, and recurrent skin or urinary tract infections. Early signs are subtle and often mistaken for normal aging.
How is Cushing's disease diagnosed in dogs?
Diagnosis involves a staged process: baseline blood work and urinalysis to identify suggestive changes (elevated ALP, dilute urine), followed by confirmatory endocrine tests — most commonly the low-dose dexamethasone suppression test (LDDST) or ACTH stimulation test. Once confirmed, abdominal ultrasound and additional tests differentiate pituitary-dependent from adrenal-dependent Cushing's, which determines the treatment plan.
Can Cushing's disease in dogs be cured?
Pituitary-dependent Cushing's (the most common form) is generally not curable but is highly manageable with daily medication (trilostane). Most dogs achieve good symptom control and quality of life for years. Adrenal-dependent Cushing's caused by a benign tumor can potentially be cured with surgical removal of the affected adrenal gland. Malignant adrenal tumors carry a more guarded prognosis.
How much does Cushing's disease treatment cost?
Initial diagnosis costs $500–$1,500 (up to $4,500 with advanced imaging). Ongoing treatment with trilostane and monitoring typically costs $980–$2,990 per year. Surgical options (adrenalectomy or hypophysectomy) range from $2,500 to $10,000+. Pet insurance may cover a portion if the policy predates the diagnosis.
What is the life expectancy of a dog with Cushing's disease?
For the most common form (pituitary-dependent, treated with trilostane), median survival is approximately 2–2.5 years, though many dogs live 3–5+ years with consistent management. Dogs with successfully removed benign adrenal tumors may live 18 months to 4+ years post-surgery. Untreated Cushing's progressively damages organ systems and shortens lifespan, though the timeline varies.
Which dog breeds are most prone to Cushing's disease?
Breeds with higher predisposition include Poodles (all sizes), Dachshunds, Yorkshire Terriers, Boston Terriers, Beagles, and Boxers. Small-breed dogs are more commonly affected by the pituitary-dependent form. German Shepherds and larger breeds have a slightly elevated risk for the adrenal-dependent form. Females are affected slightly more often than males, and most cases are diagnosed between ages 7 and 12.
Is Cushing's disease painful for dogs?
Cushing's itself is not typically painful, but its complications can be. Recurrent skin infections, urinary tract infections, muscle weakness, and hypertension can cause discomfort. Rare complications like pulmonary thromboembolism or pancreatitis are acutely painful and life-threatening. Well-managed dogs on trilostane generally appear comfortable and maintain good quality of life.
Can I treat my dog's Cushing's disease with natural remedies?
There are no scientifically validated natural or holistic treatments that can replace medical management of Cushing's disease. Some supplements (such as melatonin or lignans from flaxseed) are occasionally discussed for mild cases or as adjuncts, but evidence for their efficacy is limited. Always consult your veterinarian before adding supplements, as some may interact with trilostane or other medications. Untreated Cushing's will progress regardless of supplementation.
This article is intended for informational purposes and does not replace professional veterinary advice. If you suspect your dog may have Cushing's disease, consult your veterinarian for a proper diagnostic evaluation. For further reading, see the Merck Veterinary Manual's section on hyperadrenocorticism and the AKC's guide to Cushing's disease in dogs.
Anouk Beaumont
All our authors care for dogs every day — read more of their work on the authors page.
