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Perianal Adenomas in Dogs
Perianal adenomas are modified sebaceous tumors that occur almost only in dogs, more often around the anus of male dogs. They are usually multiple, raised, and benign, though females can show malignant forms. Surgery or freezing removes them, and castration helps.
Lipomas and Liposarcomas in Dogs and Cats
Lipomas are common, usually benign fatty tumors made of fat cells that grow slowly under the skin and rarely cause problems. Liposarcomas are the malignant form and can invade and break down. Solid lipomas are removed surgically, with weight control helping recovery.
Squamous Cell Carcinoma in Dogs and Cats
Squamous cell carcinoma is a skin tumor of the epidermal layer linked to long-term sun exposure and other skin irritation. It is the second most common skin tumor in cats and favors the head, ears, lips, and nose. Wide surgical removal is the main treatment, though it often recurs.
Sebaceous Adenomas in Dogs and Cats
Sebaceous adenomas are usually benign, curable skin tumors of older dogs and cats, most often on the back, sides, limbs, and head or neck. They appear as firm, movable, hairless lumps that may ulcerate. Complete removal or freezing cures the benign forms.
Basal Cell Tumors in Dogs and Cats
Basal cell tumors are common, usually slow-growing skin tumors of dogs and cats that arise from the basal layer of the epidermis or hair follicles. Most are benign and stay confined to the skin, though larger ones can ulcerate. Complete surgical removal is typically curative.
Penile and Preputial Tumors in Dogs and Cats
Tumors of the penis and prepuce are uncommon and, when reported, have been seen only in dogs. Types include papilloma, transmissible venereal tumor, squamous cell carcinoma, fibroma, lymphosarcoma, and hemangioma. Growths may ulcerate, bleed, and produce a foul discharge.
Transmissible Venereal Tumors in Dogs and Cats
Transmissible venereal tumor is a contagious cancer spread between dogs through mating or close contact, destroying the external genitals and nearby mucosa. It appears as a friable, cauliflower-like mass that may bleed and ulcerate. Surgery, freezing, or anti-cancer medication can clear it.
Prostatic Tumors in Dogs and Cats
Prostatic tumors occur mainly in middle-aged and older dogs and mimic benign prostatic conditions. Adenocarcinoma is the most serious type and can spread to local lymph nodes, spine, and pelvis. Signs include weight loss, thirst, back pain, and difficulty urinating.
Sertoli Cell Tumors in Dogs and Cats
Sertoli cell tumors are hormone-producing testicular tumors of older male dogs and cats that cause feminization through excess estrogen. Signs include symmetrical hair loss, enlarged breasts, and a lengthened prepuce. Surgical removal of both testicles resolves most signs within a few months.
Testicular Tumors in Dogs and Cats
Testicular tumors are among the more common tumors in older dogs and are rare in cats. They often cause feminization from excess estrogen, including attraction from other males and symmetrical hair loss. Surgical removal of the affected testicle is the standard treatment, and neutering prevents the disease.