Reader Question: Dog’s Penis and Testicles Dark in Color – Should I Be Concerned?

My dog has a dark penis color and ball color trying to find out what's the cause

Reader Question: Dog’s Penis and Testicles Dark in Color – Should I Be Concerned?

Dark Coloration on Dog’s Genitals – What It Could Mean

Reader's Question:

My dog has a dark penis color and ball color. Trying to find out what's the cause.

What the Images Show and What Might Be Going On

Thank you for submitting your question and photos. From the images, the tissue on and around your dog’s penis and scrotum appears darker in pigmentation, with a purplish or dark brown hue. While this may look concerning, there are a few important considerations to keep in mind.

Possible Causes of Dark Genital Skin in Dogs

• Normal Pigmentation: Some dogs, particularly as they mature, naturally develop darker skin on their genitals. This can be perfectly normal if there's no swelling, discharge, odor, or discomfort.
• Hyperpigmentation: Chronic licking, inflammation, friction, or hormonal changes can cause the skin to darken over time. This is often harmless but may be a sign of underlying irritation or allergy.
• Trauma or Bruising: A dark purplish tone could indicate a recent bump, scratch, or mild trauma. If the area is tender, swollen, or seems painful to touch, bruising may be the cause.
• Infection or Inflammation: Bacterial
  or fungal infections can cause discoloration, especially if there’s also redness, swelling, odor, or crusting. Check for discharge or discomfort.
• Testicular Torsion or Circulation Issues (Rare but Serious): If the testicles are extremely dark, swollen, or firm, and your dog shows signs of distress, it could be a medical emergency.
• Skin Conditions: Certain skin diseases, like localized dermatitis or even neoplastic growths, may present as dark patches or changes in texture and shape.

What You Should Do

• Monitor Closely: If your dog is not licking, scratching, or showing signs of pain, it may be normal pigmentation. Continue to watch for any changes in size, shape, texture, or behavior.
• Check for Other Symptoms: Look for swelling, discharge, odor, crusting, or discomfort. These signs would indicate something more than just color change.
• Avoid Self-Treatment: Don’t apply ointments or human creams unless directed by a vet, as this can sometimes worsen irritation.
• Schedule a Vet Visit: If the area becomes painful, the skin texture changes, or the discoloration worsens, a vet should evaluate for infection, trauma, or other underlying causes.

In many cases, darkened genital skin is normal, especially in maturing male dogs. But if you notice other symptoms or are unsure, a quick veterinary checkup can provide peace of mind and prevent complications.

Please note: This information is intended to complement, not replace, the advice of your pet's veterinarian. Always consult a vet for professional medical advice about your pet's health.