In what age range is osteosarcoma most commonly diagnosed in dogs?

Osteosarcoma is most commonly diagnosed in adult dogs, particularly those over 5 years of age. This age range is significant because osteosarcoma is generally a tumor that arises in the long bones and is more prevalent in larger breeds. The peak incidence is observed in dogs between 5 and 7 years old, aligning with the typical age for the development of this aggressive bone cancer.

While osteosarcoma can technically occur at any age, including in younger puppies or older senior dogs, its highest frequency is noted in adults, particularly in medium to large breeds like Rottweilers, Great Danes, and Doberman Pinschers. This makes the age of over 5 years the most relevant group when discussing the most common diagnosis of osteosarcoma in dogs.