Smart protocols
Working through a CHF patient now?
Use this page as the clinical reference. When you need a patient-specific pathway, the CHF Protocol in Vetool starts with species, weight, and clinical setting, then opens the relevant dog or cat branch. Feline cases include the extra questions that can change treatment.
Identify the clinical setting first
Two patients can both have Stage C CHF and still need different plans. Name the clinical setting before choosing the next step.
Acute hospital care
The patient has active, decompensated CHF and needs stabilization.
Chronic home care
The patient has a history of CHF and is stable enough for outpatient management.
Next, separate the species and underlying disease. This guide covers:
- Dogs with CHF caused by myxomatous mitral valve disease.
- Cats with CHF caused by cardiomyopathy.
This is not a diagnostic guide for unexplained respiratory distress, a preclinical heart disease staging guide, a feline arterial thromboembolism protocol, or a complete Stage D rescue pathway.
Acute CHF in dogs with MMVD
Acute care aims to reduce respiratory distress, relieve clinically important congestion, limit stress, and reassess the response. Specific recommendations differ between dogs and cats.
For a dog with acute Stage C CHF caused by MMVD, organize the plan around these steps:
Reduce congestion and respiratory effort
Loop diuretic therapy is central when cardiogenic pulmonary edema is present. Reassess respiratory rate, respiratory effort, and the overall response before continuing the initial pathway or escalating care.
Support oxygenation when needed
Provide supplemental oxygen when clinically indicated. Keep handling and procedures within what the patient can tolerate.
Treat anxiety and distress
Dyspnea and anxiety can worsen each other. The ACVIM guideline includes sedation or anxiolysis when appropriate, with monitoring of blood pressure and respiratory response.
Drain an effusion that impairs breathing
When pleural or abdominal effusion impairs ventilation or contributes to respiratory distress, thoracentesis or abdominal paracentesis may be part of stabilization.
Reassess before choosing the next branch
A dog with life-threatening pulmonary edema and a poor early response needs a different plan from one whose respiratory rate and effort improve after initial treatment. Reassess and consider an advanced CHF strategy when the expected response does not occur.
Acute CHF in cats with cardiomyopathy
For a cat with acute Stage C heart failure, use the feline recommendations rather than carrying over the canine plan.
Minimize stress early
A cat with dyspnea may deteriorate with excessive handling. Use a quiet environment and gentle restraint, and provide supplementary oxygen for respiratory distress. Prioritize tests according to what the cat can safely tolerate.
Treat congestion
Furosemide is the primary diuretic used for feline CHF. Perform thoracocentesis when pleural effusion is causing respiratory distress.
Do not give routine IV fluids in evident congestion
The feline ACVIM consensus considers IV fluid treatment contraindicated when congestion, pulmonary edema, or pleural effusion is clinically evident because fluids can worsen CHF even when a diuretic is given at the same time.
Check for low cardiac output
Look for findings such as hypotension, hypothermia, or bradycardia. Their presence opens another treatment decision; their absence keeps the patient on the congestion-focused pathway.
If low output is present, assess LVOTO
Pimobendan may be considered in acute feline heart failure with low-output signs when clinically relevant dynamic left ventricular outflow tract obstruction is absent. Low-output status and LVOTO status should be considered together.
Need the patient-specific branch?
Enter the species, weight, and acute setting in Vetool. For cats, the protocol also asks about low-output signs and LVOTO when those details become relevant. The applicable pathway and weight-based calculations stay together.
Chronic CHF in dogs with MMVD
Once the dog can be managed at home, the goal changes. The plan must control congestion, remain practical for the owner, and give the clinical team clear reassessment points. A standard Stage C workflow usually includes:
- Ongoing diuretic therapy.
- Pimobendan.
- An ACE inhibitor.
- Spironolactone.
- Home respiratory monitoring.
- Reassessment of renal function and electrolytes.
Recheck renal function after starting treatment
The ACVIM MMVD guideline recommends checking creatinine and electrolytes 3 to 14 days after starting furosemide or an ACE inhibitor. Renal response, electrolytes, respiratory rate, appetite, body weight, and comfort all inform the next decision.
Recognize progression beyond Stage C
A dog that needs progressively greater chronic diuretic support despite the standard adjunctive drugs should be reassessed for refractory disease and possible Stage D management. A gradual dose increase can otherwise hide a change in disease stage.
Chronic CHF in cats
For a stable cat with previous CHF, review congestion control, LVOTO, and left atrial size when planning home treatment.
Control congestion
Furosemide is the primary treatment for pulmonary edema or effusion. Titrate maintenance treatment to the individual patient and review it alongside the owner's resting or sleeping respiratory-rate records. The feline consensus sets a home goal below 30 breaths per minute.
Review LVOTO
Pimobendan may be considered for chronic feline CHF when clinically relevant LVOTO is absent. Record LVOTO status rather than carrying an assumption forward from an earlier visit.
Review left atrial enlargement
For a cat with a history of CHF and documented moderate to severe left atrial enlargement, the consensus recommends antithrombotic treatment with clopidogrel. Include this finding in the home plan.
Write monitoring into the home plan
Before discharge or after a chronic CHF review, write down what the owner should monitor and what should happen next.
- The clinical changes the owner should watch for.
- The patient's resting or sleeping respiratory-rate baseline and trend.
- The change that should prompt earlier reassessment.
- The date for rechecking renal function and electrolytes. For cats, the consensus recommends reassessment 3 to 7 days after discharge.
- Whether the current plan still fits the patient's CHF stage.
- For cats, whether LVOTO or left atrial enlargement changes the pathway.
Same diagnosis, different pathway
Dog with active pulmonary edema
A dog with MMVD arrives in respiratory distress from pulmonary edema. Follow the acute canine CHF stabilization pathway.
Dog stable after discharge
The same dog is comfortable at home after stabilization. Follow chronic canine Stage C management and monitoring.
Cat without low-output signs
A cat with cardiomyopathy has acute CHF but no low-output signs. Manage congestion without automatically entering the low-output branch.
Cat with low-output signs
A cat has CHF with low-output signs. LVOTO status now affects whether the additional cardiac treatment branch is appropriate.
All four patients have CHF. The species, disease, setting, and current findings determine the workflow.
Common CHF management mistakes
Using a home plan during decompensation
A home medication list is not a stabilization plan for a patient with active decompensation. Name the setting first.
Using the canine plan for a cat
The species share some treatments, but low-output status, LVOTO, pleural effusion, and thromboembolic risk create feline-specific decisions.
No reassessment after initial treatment
Initial treatment needs a reassessment point. Ask what changed and whether the current pathway still fits.
Assuming LVOTO status
LVOTO can change the role of pimobendan in feline CHF. Document the status when it affects treatment.
Missing left atrial enlargement in the home plan
Moderate to severe left atrial enlargement can change antithrombotic management in a cat with previous CHF. Carry that information into the home plan.
Respiratory rate is recorded but not used
An owner log is useful only when the team knows the patient's baseline, trend, and threshold for reassessment.
Treating every diuretic increase as routine
A rising requirement may reflect disease progression. Reassess the patient and confirm that the current stage still applies.
What a complete CHF workflow should record
For an established Stage C CHF patient, document:
- Species.
- The cardiac disease covered by this pathway.
- Acute hospital care or chronic home care.
- Current evidence of congestion and respiratory compromise.
- Response to the current treatment plan.
- The monitoring and reassessment plan.
- For cats, the relevant low-output, LVOTO, and left atrial enlargement status.
A change in any of these details may change the next step.
Ready to apply the pathway to a patient?
Open the CHF Protocol in Vetool, enter the patient details once, and follow the relevant acute or chronic dog or cat branch. The applicable calculations and monitoring points stay in the same workflow.
References
- Keene BW, Atkins CE, Bonagura JD, et al. ACVIM consensus guidelines for the diagnosis and treatment of myxomatous mitral valve disease in dogs. Journal of Veterinary Internal Medicine. 2019;33:1127-1140. doi:10.1111/jvim.15488. Read the canine MMVD consensus guideline
- Luis Fuentes V, Abbott J, Chetboul V, et al. ACVIM consensus statement guidelines for the classification, diagnosis, and management of cardiomyopathies in cats. Journal of Veterinary Internal Medicine. 2020;34:1062-1077. doi:10.1111/jvim.15745. Read the feline cardiomyopathy consensus statement
Disclaimer
For veterinary professional education and workflow support only. This guide is limited to the clinical contexts described above. It does not diagnose congestive heart failure or replace patient-specific assessment, emergency triage, clinical judgment, current veterinary guidance, product labeling, local regulations, or referral when indicated. The attending veterinary professional must confirm treatment selection, dosing, monitoring, and adjustment for the individual patient.