2: Bernese Mountain Dogs

Compared to all other dog breeds, Bernese Mountain Dogs are at a greatly increased risk for developing fatal histiocytic cancer (histiocytic sarcoma and malignant histiocytosis).

Histiocytic cancer typically afflicts Berneses between the ages of 5-8 years of age. It’s important to look for nonspecific signs include lethargy, lack of appetite, and weight loss.