# Comprehensive Guide to Senior Dog Heart Failure & MMVD
Chronic mitral valve disease (MMVD) is the most common cardiovascular disorder in aging canines, affecting over 70% of small-breed senior dogs. Understanding the pathophysiology of left apical murmurs, progressive left atrial enlargement, and bronchial compression is vital for early intervention.
---
▶ 1. ACVIM Staging & The EPIC Trial
Stage B2 Window: Identified by murmur intensity and cardiomegaly (VHS/VLAS). The landmark EPIC trial proved that early administration of Pimobendan (inodilator) extends the asymptomatic period by an average of 15 months (426 days) before congestive heart failure onset.
Stage C & D: Advanced congestive heart failure characterized by pulmonary edema, requiring triple therapy (Pimobendan + loop diuretics + ACE inhibitors).---
▶ 2. Sleeping Respiratory Rate (SRR) Monitoring
The gold standard for home monitoring: measure chest excursions for 60 seconds while the dog is in deep sleep.
Normal: < 25 breaths/min.
Emergency Threshold: Consistent counts > 30 breaths/min indicate impending cardiogenic pulmonary edema, requiring immediate veterinary triage.---
▶ 3. Nutritional Management
Strict dietary sodium restriction to minimize volume overload.
Myocardial bioenergetic support with Taurine, L-Carnitine, Coenzyme Q10, and high-dose Omega-3 fatty acids (EPA/DHA) to combat cardiac cachexia and arrhythmogenesis.
