Nose Cancer (Fibrosarcoma) in Dogs

Fibrosarcoma is a type of cancer (malignant tumor) that originates from fibrous connective tissue. Connective tissue is the supporting tissue of the body. Types of connective tissue include bone, cartilage, and ligaments. Fibrosarcoma of the nasal cavity and paranasal sinuses refers to the location of the tumor. The nasal cavity is the space within the nose through which air passes during breathing. It connects to the paranasal sinuses, the cavities or hollow spaces in the bones of the face that surround the nose. Fibrosarcoma of the nasal cavity or of the paranasal sinuses is a malignant cancer within these spaces. A fibrosarcoma specifically refers to the abnormal development of cells.

This is a slow growing, progressive, invasive tumor that is seen mostly in middle aged and old dogs. Male dogs are more prone to this condition than female dogs. 

Several signs and symptoms are associated with fibrosarcoma of nasal and paranasal sinus including:

Mucus discharge of the nose and/or eyes

Abnormal tear development (epiphora)

Pain in or around the nasal cavity


Pawing at the muzzle

Lack of appetite (anorexia)

Bad breath (halitosis)


Loose teeth

Facial deformity – especially around muzzle

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