Hypertrophic osteopathy is an abnormal enlargement of bone due to new bone formation on the outside of the diaphyses of long bones of the limbs without destruction of cortical bone. It is characterized by stiffness and a warm, firm swelling of the legs and is often accompanied with signs of lung disease such as coughing and difficulty breathing. It is often mistaken for early arthritis.
Other symptoms include lethargy, swellings at distal portions of limbs, painful limbs, decreased movement in joints due to swelling and lameness
