# Renal Amyloidosis in Shar-Peis: Symptoms, Diagnosis and Colchicine Dosing
## Key Takeaways
- Renal amyloidosis in Shar-Peis is a breed-specific, inherited condition secondary to Shar-Pei Autoinflammatory Disease (SPAID), characterized by the deposition of serum amyloid A (SAA) protein in renal glomeruli, leading to progressive kidney failure.
- Classic presenting signs include polydipsia, polyuria, lethargy, inappetence, vomiting, and swollen hocks, often preceded by recurrent fever episodes (Shar-Pei Fever).
- Definitive diagnosis relies on kidney biopsy with Congo red staining, though presumptive diagnosis is made via clinical history, breed predisposition, urinalysis (proteinuria, low USG), and bloodwork (elevated BUN/creatinine, hypoalbuminemia).
- The cornerstone of veterinary treatment is colchicine, a medication that disrupts amyloid deposition and reduces inflammation, with dosing individualized (typically 0.01-0.03 mg/kg BID) and requiring strict veterinary supervision due to a narrow therapeutic index.
- Management also necessitates comprehensive supportive care for chronic kidney disease, including a veterinary therapeutic renal diet, phosphate binders, ACE inhibitors/ARBs to reduce proteinuria, and fluid therapy as needed.
- Prognosis is guarded to poor, with early intervention and consistent management of inflammation and kidney disease being crucial for extending quality of life, as there is no cure for established renal amyloidosis.
---
If your Shar-Pei has been diagnosed with renal amyloidosis, or you suspect this condition, the most direct answer is this: renal amyloidosis in Shar-Peis is a breed-specific, inherited form of systemic amyloidosis driven by recurrent fever and inflammation (Shar-Pei Autoinflammatory Disease, SPAID). It leads to progressive kidney failure. The cornerstone of veterinary treatment is colchicine, a medication that disrupts amyloid deposition, but it must be used under strict veterinary supervision with a precise dosing schedule.
**Owner Triage Summary:** If your Shar-Pei shows excessive drinking, increased urination, lethargy, reduced appetite, vomiting, or swollen hocks (ankles), contact your veterinarian immediately. Do not attempt to treat fever or kidney disease at home. Early diagnosis and consistent medication are the only strategies that meaningfully extend quality of life.
## At a Glance: Key Facts and Clinical Decision Table
| Feature | Description |
|, - |, - |
| **Condition** | Renal amyloidosis (AA type) secondary to Shar-Pei Autoinflammatory Disease (SPAID) |
| **Breed Predisposition** | Shar-Peis, especially those with a history of familial Shar-Pei Fever (FSF) |
| **Primary Mechanism** | Deposition of amyloid A protein in kidney tissue, causing progressive glomerular damage |
| **Classic Presenting Signs** | Polydipsia/polyuria (excessive thirst/urination), lethargy, inappetence, weight loss, vomiting, swollen hocks |
| **Diagnostic Confirmation** | Kidney biopsy (gold standard); supportive findings on urinalysis, bloodwork, and genetic/clinical history |
| **First-Line Therapy** | Colchicine (veterinary prescription), alongside supportive kidney care |
| **Prognosis** | Guarded to poor. Median survival is variable, but early intervention improves quality of life; without treatment, progression to end-stage renal failure is inevitable |
| **Emergency Red Flags** | Seizures, severe dehydration, unproductive vomiting, no urine production, collapse |
**Decision Table for Owner-Veterinarian Discussion:**
| Clinical Scenario | Recommended Action | Rationale |
|, - |, - |, - |
| Shar-Pei with fever and swollen hocks, no kidney signs yet | Immediate veterinary consult; discuss colchicine prophylaxis | May prevent or delay amyloid deposition |
| Shar-Pei with increased thirst and urination | Schedule bloodwork and urinalysis within 24-48 hours | Early kidney disease may be reversible or slowable |
| Shar-Pei with vomiting and lethargy | [Emergency vet](/knowledge/veterinary-medicine/emergency-care/emergency-vet) visit | May indicate uremia or acute decompensation |
| Shar-Pei already on colchicine with diarrhea | Do not stop medication; call vet for dose adjustment | Colchicine can cause GI side effects; abrupt cessation may trigger amyloid flare |
## Anatomy and Physiology: Why the Shar-Pei Kidney Fails
Renal amyloidosis is a protein misfolding disease. In affected Shar-Peis, the liver produces an acute-phase protein called serum amyloid A (SAA). Normally, SAA is broken down and cleared. However, in Shar-Peis with SPAID, recurrent inflammatory episodes cause SAA levels to remain chronically elevated. Over time, SAA is incompletely degraded and aggregates into insoluble amyloid fibrils. These fibrils deposit in the extracellular space of tissues, most notably the renal glomeruli, the microscopic filtering units of the kidney.
The deposition of amyloid in the glomerulus disrupts the filtration barrier. The kidney loses its ability to retain protein, leading to proteinuria (protein in the urine). As amyloid accumulates, the glomeruli become scarred and sclerotic, and nephrons (functional kidney units) are destroyed. This process is progressive. The remaining healthy nephrons must compensate, but eventually they fail, leading to azotemia (accumulation of nitrogenous wastes in the blood) and uremia (clinical signs of kidney failure).
## Causes and Differentials: Why Shar-Peis Are Uniquely Affected
The primary cause of renal amyloidosis in Shar-Peis is genetic. It is strongly associated with Shar-Pei Autoinflammatory Disease, previously known as Familial Shar-Pei Fever (FSF). This is a hereditary autoinflammatory syndrome, not an autoimmune disease. In autoinflammatory diseases, the innate immune system is dysregulated, causing unprovoked episodes of fever and inflammation. In Shar-Peis, this is linked to a deficiency in the anti-inflammatory cytokine interleukin-1 receptor antagonist (IL-1RA), driven by a duplication of a gene segment. This deficiency allows unchecked inflammation to occur.
The inflammatory episodes, characterized by fever, swollen hocks (non-erosive arthritis), and sometimes abdominal pain, drive the continuous production of SAA. It is the cumulative effect of these episodes that leads to amyloid deposition.
**Differential Diagnoses:** When a Shar-Pei presents with kidney disease, the veterinarian must rule out other causes of renal failure, including:
- Chronic kidney disease (CKD) of other etiologies (e.g., glomerulonephritis, interstitial nephritis)
- Acute kidney injury (AKI) from toxins (e.g., grapes, lilies, antifreeze) or infections (e.g., leptospirosis)
- Pyelonephritis (kidney infection)
- Renal neoplasia (cancer)
- Protein-losing nephropathy from other causes
A Shar-Pei with a history of fever and swollen hocks is highly suspicious for amyloidosis, but a definitive diagnosis requires specific testing.
## Risk Factors: Breed, Age, and Genetic Predisposition
The most significant risk factor is breed. Shar-Peis are overwhelmingly overrepresented in cases of familial amyloidosis. Within the breed, individuals with a history of Shar-Pei Fever are at the highest risk. The condition is not sex-linked, affecting both males and females.
Age of onset is variable. Clinical signs of kidney disease often appear in middle age, typically between 3 and 6 years, but can occur earlier or later. Some dogs may have subclinical amyloid deposition for years before showing signs. The severity of the condition is influenced by the frequency and intensity of inflammatory episodes. A [dog](/knowledge/veterinary-medicine/clinical-methods/dog) that experiences frequent, severe fevers is more likely to develop amyloidosis earlier and with greater severity than one with infrequent episodes.
## Veterinary Examination and Diagnostics: From Suspicion to Confirmation
Diagnosing renal amyloidosis requires a systematic approach, moving from clinical suspicion to definitive confirmation.
### Clinical History and Physical Examination
The veterinarian will take a detailed history, specifically asking about:
- Episodes of fever
- Swollen, painful hocks (ankles)
- Lethargy or "not acting right" during episodes
- Changes in thirst and urination
- Appetite and weight changes
On physical examination, the veterinarian may note:
- Dehydration
- Poor body condition
- Pale mucous membranes (due to anemia from chronic kidney disease)
- Enlarged kidneys (renomegaly) or small, irregular kidneys (in advanced disease)
- Oral ulcers or uremic breath (in advanced uremia)
- Swollen, warm, painful hocks during a fever episode
### Laboratory Testing
**Bloodwork (Chemistry Panel and CBC):**
- **BUN (Blood Urea Nitrogen) and Creatinine:** Elevated in kidney failure, indicating azotemia.
- **Phosphorus:** Often elevated in advanced kidney disease.
- **Albumin:** May be low (hypoalbuminemia) due to protein loss through the kidneys.
- **Cholesterol:** May be elevated.
- **CBC:** May show anemia (non-regenerative) due to decreased erythropoietin production.
**Urinalysis:**
- **Urine Specific Gravity (USG):** Inappropriately dilute (isosthenuria, USG < 1.030) despite dehydration.
- **Proteinuria:** A key finding. The urine protein-to-creatinine ratio (UPCR) is used to quantify protein loss. A UPCR > 2.0 is significant and strongly supports a protein-losing nephropathy.
- **Active Sediment:** May show casts or cells, but is often unremarkable in amyloidosis.
**Other Blood Tests:**
- **SDMA (Symmetric Dimethylarginine):** A more sensitive early marker of kidney function decline than creatinine.
- **Blood Pressure Measurement:** Hypertension is a common consequence of kidney disease and proteinuria.
### Advanced Imaging
**Abdominal Ultrasound:** This is a valuable tool. The kidneys may appear normal in early disease. In more advanced cases, they may be enlarged and hyperechoic (brighter than normal) on ultrasound. Ultrasound is also used to rule out other causes of kidney disease, such as stones or tumors. However, ultrasound cannot definitively diagnose amyloidosis.
### The Gold Standard: Kidney Biopsy
A definitive diagnosis of renal amyloidosis requires a biopsy. The pathologist will stain the tissue with Congo red dye. Amyloid appears as an apple-green birefringence under polarized light. This confirms the presence of amyloid, but not the type. Immunohistochemistry can differentiate AA amyloid (as seen in Shar-Peis) from other types.
**Biopsy Risks:** Kidney biopsy carries a risk of hemorrhage and is typically performed by a specialist (veterinary internist or surgeon). It is often recommended when the diagnosis is uncertain or when the owner is committed to aggressive treatment and needs a definitive prognosis.
### Genetic Testing
Genetic testing for the SPAID-associated mutation is available. A positive test in a dog with clinical signs supports the diagnosis, but it is not a substitute for a biopsy. A negative test does not completely rule out amyloidosis, as other pathways may exist.
## Evidence-Based Management: Colchicine Dosing and Supportive Care
There is no cure for renal amyloidosis. The goals of treatment are to:
1. Reduce ongoing inflammation and amyloid production.
2. Manage the clinical signs of kidney failure.
3. Slow the progression of kidney damage.
4. Maintain the best possible quality of life.
### Colchicine: The Cornerstone Therapy
Colchicine is a medication that has been used for centuries to treat gout in humans. In veterinary medicine, it is used to treat Shar-Pei Fever and to prevent or slow the progression of amyloidosis. Its mechanism of action is to disrupt the assembly of amyloid fibrils and to reduce the inflammatory response.
**Colchicine Dosing in Shar-Peis:**
The dosing of colchicine is highly individualized and must be determined by a veterinarian. There is no universally fixed dose. The following are general guidelines based on clinical experience and veterinary pharmacology.
- **Starting Dose:** A common starting dose is 0.01 to 0.03 mg/kg (approximately 0.005 to 0.015 mg/lb) administered orally once or twice daily.
- **Typical Dose Range:** Most Shar-Peis are maintained on a dose between 0.3 mg and 0.6 mg per dog per day, given either once daily or divided into two doses.
- **Dose Adjustment:** The dose is often titrated based on the dog's response and tolerance. If the dog tolerates the medication well, the dose may be increased slightly to achieve better control of fever episodes.
- **Monitoring:** The veterinarian will monitor the dog's clinical signs, bloodwork (especially kidney values and liver enzymes), and complete blood count. Colchicine can cause bone marrow suppression and gastrointestinal upset.
**Important Colchicine Considerations:**
- **Toxicity:** Colchicine has a narrow therapeutic index. The difference between a therapeutic dose and a toxic dose is small. Overdosing can cause severe vomiting, diarrhea (often bloody), bone marrow suppression, and multi-organ failure.
- **Side Effects:** The most common side effects are gastrointestinal, including nausea, vomiting, and diarrhea. These are more common at the start of therapy or after a dose increase.
- **Drug Interactions:** Colchicine can interact with other medications, including some antibiotics and antifungals. The veterinarian must be informed of all medications the dog is receiving.
- **Compounding:** Colchicine is often compounded into smaller doses for dogs, as human tablets may be too large. Use a reputable compounding pharmacy.
**The Role of Colchicine in Asymptomatic Dogs:** For Shar-Peis with a history of fever but no evidence of kidney disease, some veterinarians recommend starting colchicine prophylactically to prevent amyloid deposition. This is a decision that should be made on a case-by-case basis with the owner and veterinarian.
### Supportive Care for Chronic Kidney Disease
Regardless of the underlying cause, chronic kidney disease requires comprehensive supportive care.
**Diet:** A veterinary therapeutic kidney diet is essential. These diets are restricted in protein (to reduce nitrogenous waste), phosphorus, and sodium, and are enriched with omega-3 fatty acids and antioxidants. They help to slow the progression of kidney disease and manage clinical signs.
**Phosphate Binders:** If blood phosphorus levels remain high despite a renal diet, phosphate binders (e.g., aluminum hydroxide) are added to the food. This helps to reduce phosphorus absorption from the gut.
**ACE Inhibitors / ARBs:** Medications such as enalapril or benazepril (ACE inhibitors) or telmisartan (ARB) are used to reduce proteinuria. By decreasing the pressure in the glomerulus, they reduce the amount of protein leaking into the urine and protect the remaining kidney tissue.
**Antiemetics:** If the dog is vomiting or nauseous, antiemetics such as maropitant (Cerenia) or ondansetron are used.
**Fluid Therapy:** In cases of dehydration or acute decompensation, subcutaneous or intravenous fluids are necessary. For long-term management at home, some owners are taught to give subcutaneous fluids to their dogs.
**Antacids:** Medications to reduce stomach acid (e.g., omeprazole) may be needed to manage uremic gastritis.
**Erythropoietin:** If the dog becomes severely anemic due to decreased erythropoietin production, synthetic erythropoietin (e.g., darbepoetin) may be prescribed. This is a more advanced treatment and requires careful monitoring.
**Blood Pressure Management:** Hypertension is common in kidney disease and can worsen proteinuria and kidney damage. Blood pressure should be monitored regularly and treated with amlodipine if elevated.
### Managing Shar-Pei Fever Episodes
In addition to colchicine, acute fever episodes may require treatment. Non-steroidal anti-inflammatory drugs (NSAIDs) are generally avoided in dogs with kidney disease due to the risk of further renal damage. If pain and fever are severe, the veterinarian may use other pain management strategies or short courses of corticosteroids, but these must be used with extreme caution.
## Unsafe Home Remedies and Owner Misconceptions
It is critical to avoid unproven or dangerous home remedies.
- **Do Not Give Human NSAIDs:** Medications like ibuprofen, naproxen, or aspirin are highly toxic to dogs and can cause acute kidney failure and gastrointestinal ulcers. Never administer these without veterinary instruction.
- **Do Not Use "Natural" Anti-Inflammatories Without Vet Approval:** Supplements like turmeric or high-dose fish oil may have theoretical benefits, but they can interfere with medications or have their own side effects. Always discuss supplements with your vet.
- **Do Not Restrict Water:** A dog with kidney disease must have constant access to fresh, clean water. Restricting water will worsen dehydration and accelerate kidney failure.
- **Do Not Use Home "Detox" Protocols:** There is no evidence that any home detox protocol can remove amyloid from the kidneys. These protocols are often harmful and can cause severe electrolyte imbalances.
## Prevention: Managing the Shar-Pei Fever Phenotype
Prevention of renal amyloidosis focuses on managing the underlying inflammatory disease.
- **Responsible Breeding:** Shar-Pei Fever and amyloidosis are heritable. Responsible breeders should screen their breeding stock for the SPAID-associated genetic mutation and avoid breeding affected or carrier dogs.
- **Early Colchicine Therapy:** For Shar-Peis that have had one or more fever episodes, early initiation of colchicine may help prevent or delay the onset of amyloidosis. This is a proactive strategy that requires a partnership with a veterinarian.
- **Prompt Treatment of Inflammatory Episodes:** While NSAIDs are often contraindicated, prompt veterinary care for fever episodes can help manage the inflammatory burden, even if only through supportive care.
## Prognosis: What to Expect
The prognosis for a Shar-Pei with clinical renal amyloidosis is guarded to poor. The disease is progressive, and there is no cure. However, the rate of progression is highly variable.
- **Without Treatment:** The disease progresses relentlessly to end-stage kidney failure. Euthanasia is often considered when the dog's quality of life deteriorates significantly.
- **With Early and Aggressive Treatment:** Dogs diagnosed early (before severe azotemia) and treated with colchicine, a renal diet, and supportive care may live for months to a few years with a good quality of life.
- **With Advanced Disease:** If the dog is diagnosed in advanced kidney failure (high creatinine, severe uremia), the prognosis is poor even with treatment. The goal shifts to palliative care.
The response to colchicine is variable. Some dogs respond well, with a reduction in fever episodes and a stabilization of kidney values. Others do not tolerate the medication or do not respond adequately.
## Limitations and When to Contact a Veterinarian
This article provides general veterinary information, but it cannot predict the outcome for any individual dog. Breed-level information does not account for individual variability in disease severity, genetic background, or response to treatment. The presence of other health conditions, such as concurrent infections or other organ dysfunction, can significantly alter the prognosis and treatment plan.
**You should contact your veterinarian immediately if your Shar-Pei exhibits any of the following:**
- **Emergency Red Flags:** Collapse, seizures, inability to stand, no urine production for more than 12 hours, or severe difficulty breathing.
- **Signs of Uremia:** Persistent vomiting, diarrhea, loss of appetite, lethargy, or bad breath.
- **Signs of Dehydration:** Sunken eyes, dry gums, loss of skin elasticity.
- **Signs of Colchicine Toxicity:** Severe vomiting, bloody diarrhea, or extreme weakness.
- **Any change in condition:** If your dog's condition worsens or does not improve with treatment, call your vet.
Never adjust the dose of colchicine or any other medication without explicit instructions from your veterinarian. Dosing errors can be fatal.
## Frequently Asked Questions
### 1. What are the first signs of renal amyloidosis in a Shar-Pei?
The first signs are often subtle and include increased thirst (polydipsia) and increased urination (polyuria). You may also notice lethargy, reduced appetite, and weight loss. Some dogs may have a history of recurrent fevers and swollen hocks before kidney signs appear.
### 2. How is renal amyloidosis diagnosed in Shar-Peis?
A definitive diagnosis requires a kidney biopsy stained with Congo red dye. However, a presumptive diagnosis is often made based on a combination of breed, history of Shar-Pei Fever, significant proteinuria (high UPCR), and progressive kidney failure. Ultrasound and bloodwork support the diagnosis.
### 3. What is the correct colchicine dose for a Shar-Pei with amyloidosis?
There is no single "correct" dose. It is individualized. A typical starting dose is 0.01 to 0.03 mg/kg once or twice daily, but your veterinarian will determine the exact dose based on your dog's weight, kidney function, and tolerance. Never self-dose.
### 4. How long can a Shar-Pei live with renal amyloidosis?
Survival time is highly variable. Without treatment, it can be weeks to months after diagnosis. With early, aggressive treatment (colchicine, renal diet, supportive care), some dogs live for 1 to 3 years or longer, maintaining a good quality of life. The prognosis is worse if diagnosed in advanced kidney failure.
### 5. Is renal amyloidosis in Shar-Peis painful?
The kidney disease itself is not typically painful. However, the associated Shar-Pei Fever episodes can cause significant pain, particularly in the hocks (ankles) and abdomen. Advanced uremia can cause painful oral ulcers and gastrointestinal discomfort.
### 6. Can diet alone treat renal amyloidosis in Shar-Peis?
No. Diet is a critical component of managing the kidney failure, but it does not treat the underlying amyloid deposition. A veterinary renal diet helps reduce the workload on the kidneys and manage clinical signs, but it must be combined with colchicine and other medications to slow disease progression.
### 7. Are there any side effects of colchicine in dogs?
Yes. The most common side effects are gastrointestinal, including nausea, vomiting, and diarrhea. These are more common at the start of therapy. Colchicine can also cause bone marrow suppression, which is why regular bloodwork monitoring is essential. Overdose is dangerous and can be fatal.
### 8. Should I breed my Shar-Pei that has had Shar-Pei Fever?
No. Shar-Pei Fever and the associated renal amyloidosis have a strong genetic component. Breeding an affected dog increases the risk of passing the disease to offspring. Responsible breeders should screen for the SPAID-associated mutation and avoid breeding affected or carrier animals.
## Related Clinical & Scientific Guides
* [Urethral Prolapse in Bulldogs: Diagnosis, Treatment and Prevention](/knowledge/veterinary-medicine/urology-nephrology/urethral-prolapse-in-bulldogs-diagnosis-treatment-and-prevention)
* [Urinary Tract Infection in Dogs: Diagnostic Rules and Antibiotic Stewardship](/knowledge/veterinary-medicine/urology-nephrology/urinary-tract-infection-in-dogs-diagnostic-rules-and-antibiotic-stewardship)
* [Fanconi Syndrome in Basenjis: Genetic Testing and Urine Glucose Management](/knowledge/veterinary-medicine/urology-nephrology/fanconi-syndrome-in-basenjis-genetic-testing-and-urine-glucose-management)