Differentiate systolic vs diastolic heart failure in dogs and list common supportive imaging findings.

• A. Systolic HF: reduced contractility; signs include weakness, exercise intolerance; Diastolic HF: impaired filling due to stiff ventricle; Imaging: echocardiography shows reduced EF in systolic HF and normal/elevated EF in diastolic HF.
• B. Systolic HF: increased contractility; signs: tachycardia; Diastolic HF: decreased HR; Imaging: same.
• C. Systolic HF: no edema; Diastolic HF: edema only; Imaging: no.
• D. Systolic HF: hyperdynamic heart; Diastolic HF: decreased heart size; Imaging: same.

Answer: (A)