Table 2. Cancer types represented in the study population of 3,452 dogs.
| Cancer type and/or location | Number of dogs |
|---|---|
| Lymphoma/lymphoid leukemia | 979 |
| Bone, osteosarcoma | 664 |
| Mast cell tumor | 565 |
| Hemangiosarcoma | 292 |
| Soft tissue sarcoma | 240 |
| Malignant melanoma | 128 |
| Lung | 113 |
| Oral cavity | 67 |
| Skin | 44 |
| Histiocytic sarcoma | 40 |
| Peripheral nerve sheath | 33 |
| Anal sac adenocarcinoma | 29 |
| Multiple concurrent primary cancers | 27 |
| Unknown* | 25 |
| Chondrosarcoma | 22 |
| Liver | 22 |
| Urinary bladder/urethra | 18 |
| Nasal cavity and paranasal sinuses | 16 |
| Mammary gland carcinoma | 15 |
| Thyroid | 15 |
| Bone, multilobular osteochondrosarcoma | 12 |
| Bone, fibrosarcoma | 9 |
| Adrenal gland | 8 |
| Bone, sarcoma (other) | 8 |
| Brain | 8 |
| Spleen | 8 |
| Kidney | 6 |
| Small intestine | 6 |
| Prostate | 5 |
| Transmissible venereal tumor | 5 |
| Heart base | 3 |
| Pancreas | 3 |
| Bile duct | 2 |
| Mediastinum | 2 |
| Multiple myeloma | 2 |
| Salivary gland | 2 |
| Spinal cord | 2 |
| Ear canal | 1 |
| Esophagus | 1 |
| Large intestine | 1 |
| Nasal planum | 1 |
| Thymoma | 1 |
| Uterus | 1 |
| Vagina | 1 |
Classification of cancer types was based primarily on anatomic location; adapted from Withrow and MacEwen’s Small Animal Clinical Oncology (Sixth Edition) and from the American Joint Committee on Cancer (AJCC) Manual (Eighth Edition).
* Diagnosis of malignancy was confirmed, but cancer type was not assigned given limited clinical information in the underlying dataset. All patients originated from cohort 2.