The 10-year-old Shih Tzu coughs frequently. Now she cannot lie down on her chest but sits upright overnight. Her rectal temperature is low.

Blood test shows bacterial infection of the blood. X-rays shows a much enlarged left heart with most of the lungs filled with fluid. Heart and antibiotic medication are prescribed.

When an old dog coughs frequently, do consult your vet promptly as the dog may die from heart failure if no treatment is given.