SciRouter Oncology / Cancer guide / Canine Melanoma
Canine cancer guide

Canine Melanoma

A cancer of melanocytes. Behavior depends heavily on location: oral and digital forms metastasize aggressively; cutaneous forms are usually indolent.

also known as Oral melanomaalso known as Cutaneous melanoma
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Prevalence

The most common oral malignancy in dogs (~30–40% of oral tumors). Cutaneous melanomas are usually benign; oral, mucosal, nail-bed, and ocular forms tend to be malignant.

Who gets it

Older dogs (median 11 years). Heavily-pigmented breeds: Scottish Terriers, Standard Poodles, Cocker Spaniels, Chow Chows.

Symptoms to watch for

  • Mass in the mouth, on a nail bed, or on a paw pad
  • Bad breath, bleeding from the mouth, drooling, dropping food (oral)
  • Limping or swelling of a single toe (digital)
  • Pigmented or unpigmented mass; can be amelanotic (color-less) and harder to recognize

How it's diagnosed

  • Biopsy + histopathology (excisional preferred for digital)
  • Immunohistochemistry (Melan-A, PNL2, S100) for amelanotic tumors
  • Three-view chest radiographs + abdominal ultrasound for staging
  • Regional lymph node aspirate
  • Ki-67 proliferation index — strongly prognostic

Prognosis ranges

Stage I oral: median ~17 months. Stage IV: median 3 months. Digital: median 12 months post-amputation. The Oncept melanoma vaccine offers a survival benefit when added to local control.

Treatment landscape

Wide surgical excision (or rostral mandibulectomy/maxillectomy for oral)Surgery
ResponseLocal control depends on stage and margins
ToxicityFunctional recovery is good even with significant resection; cosmesis is the main concern.
Cost range$3,500–$8,000
Oncept (canine melanoma DNA vaccine, Merial)Vaccine
ResponseSurvival benefit shown in stage II/III oral melanoma after local control
ToxicityGenerally well-tolerated; monthly boosters.
Cost range$2,000–$4,000
Hypofractionated radiationRadiation
Response~70% local response
ToxicityMucositis, mild dermatitis.
Cost range$5,000–$8,000
Gilvetmab (anti-PD-1) — investigational combinationsImmunotherapy
ResponseActive research; combination with vaccine showed benefit in canine glioma
ToxicityGenerally well-tolerated; immune-related adverse events possible.
Cost rangeTrial-funded

Recurrent mutations in this cancer

Frequencies from canine clinico-genomic cohorts. SciRouter Oncology auto-checks every mutation in your dog's report against the OncoKB-aligned database for matched targeted therapies.

GeneFrequency
NRAS
18%
PTEN
11%
MAP2K1
9%
TP53
9%

Questions to ask your vet

  • Where is the primary — oral, digital, cutaneous, or ocular? It changes everything.
  • What stage are we?
  • Do we have clean margins on the excision?
  • Should we add Oncept after surgery?
  • What's the Ki-67 index?
  • Is gilvetmab available through any trial?

Quality-of-life notes

Oral melanoma surgery looks dramatic but most dogs eat normally within days. Pain control during the first week is critical.

Other canine cancers