There is no definitive answer. A horse's lung weight varies significantly by:
- Size and breed: Larger horses have larger lungs.
- Age: Lungs grow and change over time.
- Health: Disease or infection can affect lung size and weight.
General Estimates
- Typical horse lung: Around 1–2 kilograms (2.2–4.4 pounds).
- Large breeds: May weigh closer to 3 kilograms (6.6 pounds) or more.
These are rough estimates. Consult a veterinarian for concerns about a horse's lung health.