Melanoma in dogs isn't one thing, and where it appears changes everything. A melanoma on the skin often behaves very differently from one in the mouth, which is exactly the distinction that shapes what happens next.
Melanoma in dogs occurs on the skin, in the mouth (oral melanoma), and around the nail bed, and location strongly affects how it behaves. Skin melanomas are often benign, while oral and nail-bed melanomas tend to be more aggressive. Because you can't judge behavior by looking, any dark or growing mass, especially in the mouth or on a toe, warrants a vet. Treatment is directed by your veterinary team.
About Palladia (toceranib): this is a prescription medication your veterinarian can prescribe. Read our guide, or ask us if you need help sourcing it.
Why location matters so much
A melanoma on haired skin is frequently benign and cured by removal. An oral melanoma (in the mouth) or a nail-bed melanoma (on a toe) tends to be more aggressive and prone to spread. Same cancer name, very different outlooks, which is why your vet's assessment of type and location drives the plan. [1]
What to watch for
A dark (sometimes pink or unpigmented) mass on the skin, gums, or lips; a swollen or painful toe with nail changes; bad breath, drooling, or bleeding from the mouth; or difficulty eating. Oral tumors are easy to miss until they're advanced because owners don't routinely look inside the mouth. [2]
Diagnosis and options
Diagnosis involves sampling the mass and staging, directed by your vet and often an oncologist. Options vary widely by type and location and may include surgery and other therapies; a melanoma vaccine exists for certain cases. Your oncologist explains what's realistic for your dog. We never diagnose or set doses.
Where a pharmacy fits
If your oncologist prescribes a medication we carry as part of the plan, we can supply it in collaboration with your team. Diagnosis, staging, and treatment choices stay with your clinicians.
Frequently asked questions about melanoma in dogs
Is melanoma in dogs always serious?
No, skin melanomas are often benign. Oral and nail-bed melanomas tend to be more aggressive. Location matters.
How do I spot oral melanoma?
Look for dark masses in the mouth, bad breath, drooling, or bleeding. Check your dog's mouth periodically.
Who directs treatment?
Your vet and an oncologist. We never set doses.
Related cancers & oncology guides
Dog cancer symptoms · Signs of cancer · Lymphoma in dogs · Lymphoma treatment · Lymphoma life expectancy · Lymphoma stages
Sources & References
For educational use. PrepperPetSupply is a licensed, veterinarian-staffed pharmacy; prescriptions are dispensed only after review by a licensed veterinarian and are not a substitute for in-person veterinary care. Not for human use.