Many things can cause brown spots on your dogs belly. While some of these conditions are secondary, others can be caused by natural aging. Knowing the causes of brown spots is crucial so you know when your dog should be taken to the vet. Recognizing when a spot isn’t benign and requires medical attention is essential.



Brown spots on dogs belly looks like dirt


As well as causing brown spots on the dogs skin, allergies can also cause other symptoms like itching and paw-licking. My articles on allergies are available here.

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Age Spots

Your dog can get age spots. Despite her fur, she is still vulnerable to UV rays from the sun. Her hair is more susceptible to sun damage and can develop age spots. These brown spot’s are located around her belly and nose. A buildup of melanin on the dogs skin can cause age spots. Pigmentation is caused by melanin.



Many things in your dog may cause hyperpigmentation. Hyperpigmentation can be classified into two types. Also, the primary type will usually show up by the age of one year.

Other conditions can cause hyperpigmentation. This may not be an issue compared to your larger concerns about your dog. You may think your dog has an allergy or skin condition.

Hyperpigmentation occurs when the skin of your dog begins to thicken or darken. Hyperpigmentation does not indicate a specific disease. It is simply a reaction to other skin conditions.



Hyperpigmentation sign in dogs

The signs discussed here indicate hyperpigmentation and not the underlying conditions your dog might be suffering from.

  • Coloration – These areas may appear light brown to black.
  • Skin changes: The affected area can become rough, velvety, or thickened. There may also be hair loss.
  • Hyperpigmentation-prone areas – Your groin, legs, and armpits are all likely to be affected.
  • Reddened areas may appear around the edges. This is caused by a yeast or bacterial infection secondary to hyperpigmentation. It can also spread to other parts of his body.

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Dog Yeast Infections

Yeast, also known as fungus, is present in pets as part of the normal flora, which is both internal and external. All is fine as long as the body is healthy. If the immune system is depressed or the dog has to be given antibiotics or shaved or scratched, yeast can infiltrate the skin and grow underground.

You can see the first signs of yeast in dogs when they appear as tiny black or brownish spots on the underbelly, around the genitals, or at the joint of the legs. These spots can be mistakenly thought to be flea specks, dirt, or part of the aging process and often go unnoticed. The yeast infection has spread throughout the body when you notice it. It is similar to seeing a mushroom growing on the forest floor. The fungus’ rhizomes, or roots, have spread to many acres underground by this point. The same goes for yeast. It is the same. Although it goes through a typical year, its cycle changes with the seasons, but it does not disappear on its own.


Symptoms of a yeast infection

No matter how the infection started, any one of these symptoms is a strong indicator. If a dog has more than one of these symptoms, it is almost certain that the dog has a yeast infection.

  1. You can see dark rusty-red hair between your toes and the bottom of the feet by chewing or licking them. There’s always a good reason why a dog chews on his feet. It could be a cut, itchy skin, a sore toe, or something bothering him. Foot-chewing is almost always due to yeast infection between the nails and between the toes. The yeast infection causes the hair to turn reddish or rusty, not the licking.
  2. Head shaking, or rubbing the ears. Ear mites can also cause severe itching.
  3. Loss of appetite and lethargy. Many things can cause this, but if it is combined with any of the symptoms listed, a yeast overgrowth is most likely to be the cause.
  4. Cyclic manifestations of symptoms (appearing in spring and disappearing in fall) are often mistaken for grass allergies or other spring and summer symptoms. True allergies are rare. Yeast is quite common. Moreover, it is best to get rid of the most common diseases first.
  5. Hair falls on the upper back and tail. This can happen for many reasons, but yeast is the most common.
  6. You may notice speckles (like small black dots) under the skin or around the genitals. Regular grooming or at least every other week should detect this early sign of yeast.
  7. A foul smell and greasy hair characterize seborrhea. This condition is often accompanied by heavy dandruff. It is a yeast infection that affects the hair follicles. It is relatively simple to reverse using DERMagic products.
  8. Baldness can be caused by having your hair shaved close to the skin. A hot knife can be used to inject yeast under the skin of a dog for surgery. It will eventually kill the hair follicles. DERMagic Skin Rescue Lotion can bring it back.
  9. Any dark skin color, especially when it is associated with hair loss.



Why is my dog developing brown spots on her skin?

Brown spots can develop on the skin of a dog for many reasons. In fact, these spots can be secondary or primary hyperpigmentation. Age spots may appear as your dog gets older. Also, the skin can become leathery and brownish from chronic yeast infections. Fleas can cause your dog to leave flea-related dirt on her skin, such as her stomach and groin. Some dogs can also develop melanomas, which will manifest as skin spots.

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Does a dog get brown spots on its skin?

The only two regular brown spots a dog should have on their skin are age spots and dirt. Any other problem can cause concern for her health.

Spots are a sign of a flea infestation and, if not treated, can lead to serious health problems. Spots can also indicate underlying medical conditions that must be treated.




Brown spots on a dogs belly can look like dirt for many reasons. Some spots are secondary, while others develop naturally with age. Brown spots can appear on dogs belly due to allergies, aging, hyperpigmentation and chronic yeast infections. Your veterinarian should inspect any spot that seems irregular or unchanging.


I’m a long-time animal lover and owner of two dogs and three cats. I grew up on a farm where we had all sorts of animals, from cows and horses to pigs and chickens. My love for animals led me to pursue a career in writing about them. I have been a pet care writer for over 5 years and have extensive knowledge of animal care, health, and behavior.

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