Prostate cancer Prostate cancer is rare in dogs and occurs in both intact and neutered animals. It is malignant. The most common type is adenocarcinoma. Signs include blood in the urine and straining to urinate or defecate. It most commonly spreads to bone and the lungs.
Squamous cell carcinoma Squamous cell carcinoma is a malignant tumor in dogs that most commonly occurs in the oral cavity, including the tongue, tonsils, and gingiva. Squamous cell carcinoma accounts for 5 percent of skin tumors in dogs, and are the most common tumor of the toe. Dogs with unpigmented skin on the nose may develop this cancer from long-term sun exposure.
Testicular tumors Testicular tumors are the most common tumor of the canine male reproductive tract. Tumor types include Sertoli cell tumor, seminoma, and interstitial cell tumor. None commonly metastasize.
Thyroid cancer Thyroid cancer is rare and usually nonproductive in dogs (unlike in cats, in which it causes hyperthyroidism). One-third of thyroid tumors are small benign adenomas; the rest are malignant carcinomas, usually large and invasive.
Uterine cancer Uterine cancer is very rare in dogs. The most common type is benign leiomyoma.