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- Lumps (which are not always malignant, but should always be examined by a vet)
- Swelling
- Persistent sores
- Abnormal discharge
- Bad breath
- Listlessness/lethargy
- Rapid, often unexplained weight loss
- Sudden lameness
- Black, tarry stools (a symptom of ulcers, which can be caused by mast cell tumors)
- Decreased or loss of appetite
- Difficulty breathing, urinating or defecating
- Lumps (which are not always malignant, but should always be examined by a vet)
- Swelling
- Persistent sores
- Abnormal discharge
- Bad breath
- Listlessness/lethargy
- Rapid, often unexplained weight loss
- Sudden lameness
- Black, tarry stools (a symptom of ulcers, which can be caused by mast cell tumors)
- Decreased or loss of appetite
- Difficulty breathing, urinating or defecating

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
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