A growing or changing lump

Swollen lymph nodes

Sudden abdominal swelling

Unexplained bleeding from the mouth, nose, or genital area

Difficulty when breathing, chewing, swallowing, urinating, or defecating

Persistent sores or swelling

Unexplained bad breath or other odor

Dry cough

Lowered stamina

Recurrent vomiting or diarrhea

Loss of weight or appetite

Lack of interest in physical activities

Indications of physical discomfort, such as lameness or stiffness