Shih Tzu Skin Health Black Spots Causes Diagnosis and Care

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Posted Oct 29, 2024

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Couple Hugging a Shih Tzu
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Black spots on a Shih Tzu's skin can be a concerning issue for any owner.

These spots are often a sign of skin cancer, specifically melanoma, which can be caused by prolonged exposure to the sun.

Shih Tzus are more prone to skin cancer due to their thin skin and lack of pigment.

Regular skin checks and sun protection can help prevent skin cancer in Shih Tzus.

Some black spots may be benign, but it's always best to consult a veterinarian for a proper diagnosis.

The veterinarian will examine the spot and may take a biopsy to determine its cause.

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Causes of Black Spots

Black spots on your Shih Tzu's skin can be a cause for concern, but in most cases, they're not as alarming as they seem. Black scabs on dogs are usually just a healing injury, but they can also result from infections, allergies, endocrine and immune disorder, genetic problems, or even cancer.

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If you notice black spots on your dog's coat that resemble little grains of black sand, it could be a sign of a flea infestation. Flea dirt can be mistaken for mud, but there's a simple test to distinguish between the two: the Wet Paper Test.

To perform the Wet Paper Test, wet a sheet of plain white paper, brush some of the suspicious debris out of the coat onto the paper, and try to smudge some of the black dots. If the smudges are brown, they're probably mud. If they smear to red, then this is digested blood - a sure sign that the spots are actually flea dirt.

Flea dirt in a dog's coat can look like dirt, but it's actually digested blood. The more faeces you see, the more fleas are likely present in the house. Treatment of the affected dog is essential, and it's also crucial to treat the environment where 95% of the flea population is lurking, as eggs, larvae, and pupae waiting to develop and hop back on board.

Here are some possible causes of black spots on your Shih Tzu's skin:

  • Healing injury
  • Infections
  • Allergies
  • Endocrine and immune disorder
  • Genetic problems
  • Cancer
  • Flea infestation

Symptoms and Signs

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Shih Tzus with black spots on their skin can exhibit a range of symptoms, from mild to severe.

Their skin may appear dry, flaky, and itchy, especially on the elbows, knees, and face.

This can lead to excessive scratching and chewing, which can cause further irritation and even infections.

Redness, swelling, and hair loss may also be present in affected areas.

In some cases, the black spots can be a sign of a more serious underlying issue, such as allergies or skin infections.

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Scabbing

Scabbing can be a sign of underlying issues in your furry friend. In many cases, scabs on dogs can heal between 3 and 14 days.

Treating the underlying cause is crucial for healing scabs. This could be things like allergies, irritation, skin imbalances, and fleas.

Infected scabs can take longer to heal, so keep a close eye on your dog's condition.

Skin Discoloration with Itching

Skin discoloration with itching can be a frustrating and unsettling symptom.

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Dark spots or patches may appear on the skin, often accompanied by a persistent itch.

In some cases, the itching can be severe and disrupt daily life.

Skin discoloration with itching can be a sign of an underlying condition, such as eczema, psoriasis, or dermatitis.

These conditions can cause inflammation and damage to the skin, leading to discoloration and itching.

In some cases, skin discoloration with itching can be a side effect of medication or a reaction to an allergen.

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Diagnosis and Management

Diagnosis of shih tzu skin problems, like black spots, can be challenging. Cytologic examination is the most practical method of diagnosis, and it involves collecting samples from the skin using various methods such as glass slide impression, acetate tape impression, or superficial skin scraping.

A diagnosis of Malassezia dermatitis, a common skin condition in shih tzus, relies on the combination of clinical presentation and cutaneous cytology. Even low numbers of Malassezia organisms noted on cytology may indicate Malassezia dermatitis if samples are collected from inflamed, pruritic skin.

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Fungal cultures are not helpful in diagnosing Malassezia dermatitis because M. pachydermatis are commensal organisms, making their isolation in culture of little or no diagnostic value.

To confirm a diagnosis, it's essential to follow up with cytology to ensure that Malassezia organisms are present, especially if clinical symptoms or skin lesions recur.

Treatment for shih tzu skin problems, including black spots, usually involves a combination of topical and systemic therapy. Topical therapy alone may be adequate for some patients, but it's often challenging to use extensive topical therapy on dogs with thick hair coats or those that are large or non-compliant.

Oral antifungal therapy, in combination with topical therapy, is most effective for patients with generalized or multifocal lesions. Oral antifungal drugs such as ketoconazole, fluconazole, terbinafine, and itraconazole are effective against Malassezia organisms.

For mild cases or localized lesions, frequent topical therapy with antifungal products containing ingredients such as 2% ketoconazole or 2% miconazole is usually effective.

Specific Conditions

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Skin tumours are quite uncommon in dogs, but if you notice any unusual growths, seek veterinary attention as soon as possible.

These tumours can have a brown or black appearance, often irregular in shape, similar to a blackberry embedded in the skin.

If you notice any of these growths evolving over time, it's crucial to get your Shih Tzu checked by a vet as soon as you can, as early detection can lead to more effective treatment.

Bacterial Infections

Bacterial infections are a common reason dogs develop crusty scabs on their skin.

Dogs are prone to bacterial infections because their skin has a higher pH than most animals, making it easier for harmful bacteria to colonize or overgrow.

Pyoderma is a term used to describe most skin infections in dogs, and it can be caused by various factors such as insect bites, injuries, or excessive scratching.

A dog staph infection is a type of pyoderma that can appear as red bumps or pimples, often with a red, crusty edge and dark center.

These infections can also occur in skin folds, especially in wrinkly breeds like Shar Peis and English Bull Dogs, causing a condition known as skin fold pyoderma or intertrigo.

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External Parasites

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External parasites can be a real nuisance for dogs, causing scabs and discomfort. They're often tiny and hard to spot, but they can have a big impact on your furry friend's health.

Some common external parasites that can cause scabs on dogs include fleas, ticks, and mites. Fleas, in particular, are known to cause flea allergy dermatitis, which leads to scabs and sores on the skin. If your dog is allergic to flea saliva, they may develop scabs and scabies.

Fleas can be a real problem, especially since 50% of them carry bacterial disease. If that disease gets into an open wound on your dog, it can cause a bacterial infection. To avoid this, make sure to use flea prevention methods and keep an eye out for any signs of fleas on your dog.

Ticks are another parasite that can cause scabs on dogs. They nestle into the skin and feed on blood, leading to irritation and scabbing. If you suspect your dog has a tick, you can remove it using a tick twister or tweezers, making sure to get the whole head out to avoid infection.

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Here's a quick rundown of the parasites that can cause scabs on dogs:

  • Fleas: cause scabs and sores due to flea allergy dermatitis
  • Ticks: nestle into skin, feed on blood, and cause irritation and scabbing
  • Mites: can cause mange, which leads to scabs and skin irritation

It's essential to keep an eye out for these parasites and take action if you suspect your dog has one. With the right prevention methods and treatment, you can help your furry friend stay healthy and happy.

Hormonal Imbalance

Hormonal Imbalance can wreak havoc on your dog's skin, leading to dryness, itching, and scabs.

Changes in hormone levels can cause a range of issues, including pyoderma, a skin condition that's common in dogs.

Dogs with hormonal imbalances may experience symptoms like skin irritation and scabbing, which can be quite uncomfortable for them.

Endocrine problems like Cushing's disease and hypothyroidism can also contribute to hormonal imbalances that affect your dog's skin.

Hormonal imbalances can be caused by a variety of factors, including genetic predisposition and environmental influences.

For your interest: Shih Tzu Hypoallergenic Dogs

Malassezia Dermatitis

Malassezia Dermatitis is a condition that can cause crusty scabs on your dog's skin. It's a hypersensitivity reaction to the Malassezia organism, which is a common fungus that lives on the skin of healthy dogs.

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This condition is often associated with atopic dermatitis, a common skin allergy in dogs. Research has shown that dogs with atopic dermatitis have higher levels of Malassezia-specific immunoglobulin E, suggesting that Malassezia may play a role in their skin problems.

Malassezia hypersensitivity can be diagnosed through a complete dermatologic workup, including cytological findings and a thorough examination of the dog's skin. In some cases, intra-dermal allergy testing may be used to confirm the diagnosis.

If your dog is diagnosed with Malassezia hypersensitivity, your veterinarian may recommend immunotherapy with M. pachydermatis antigens to help manage the condition. However, this treatment may not be effective for all dogs, and pulse therapy may be needed to prevent recurrence.

Here are some key facts about Malassezia dermatitis:

Tumors

Skin tumours are quite uncommon in dogs, but they can be a serious concern if left untreated.

Several skin tumours can have a brown or black appearance.

They are usually dark or black and often irregular, resembling a blackberry embedded in the skin.

If you notice such a presentation evolving over time, it's essential to seek veterinary attention as soon as possible.

The earlier these disorders are caught, the more effective treatment is likely to be.

Comedones

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Comedones are a common sign of skin disease, occurring when pores become blocked and fill with cellular or oily material.

These blockages can be infected or not, but they're usually a sign of some dysfunction within the skin.

Comedones, or blackheads, are often caused by a combination of factors, and a dog with more than one comedone should be seen by a vet.

Inflammation, redness, or discomfort around a blackhead can be a sign of a more serious issue, so it's essential to monitor your dog's skin health.

If you notice multiple comedones or any signs of distress, it's best to consult with a veterinarian for proper advice and care.

Pyoderma

Pyoderma is a common skin condition in dogs that can cause crusty scabs. It occurs when the skin barrier is damaged, allowing bacteria to infect the skin.

One of the main reasons dogs develop pyoderma is because of their higher skin pH, making it easier for harmful bacteria to colonize. This can be caused by various factors, including insect bites, injuries, friction, excessive scratching, endocrine problems, genetic conditions, or hormonal imbalances.

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Dogs are prone to developing pyoderma, especially in areas with high friction or moisture. This is why breeds with wrinkly skin, such as Shar Peis and English Bull Dogs, are more susceptible to skin fold pyoderma or intertrigo.

Some types of pyoderma can cause red bumps or pimples, while others may present as round scabs with a red, crusty edge and dark center. A common type of pyoderma is a dog staph infection, which can be treated with antibiotics if caught early.

Here are some common types of pyoderma that can cause crusty scabs:

  • Folliculitis: inflammation of hair follicles that can cause scabs
  • Pyotraumatic dermatitis or hot spots: moist, foul-smelling areas that need veterinary treatment
  • Other types of pyoderma: including those caused by hormonal imbalances or skin fold pyoderma

Prevention and Treatment

Treating crusty scabs on your Shih Tzu requires finding and addressing the underlying cause. This means checking with a vet and carrying out necessary tests to rule out conditions like allergies, irritation, skin imbalances, and fleas.

Cleaning scabs is an essential process to prevent infection, and a water rinse can help remove loose dirt or debris. Disinfecting the area with dog-safe anti-itch or antibiotic sprays can also help keep infection at bay.

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To prevent scabs from occurring in the first place, you can use supplements like fish oil to promote skin and coat health. Regular grooming and check-ups with your vet can also help identify potential issues before they become major problems.

Here are some simple steps to follow if your Shih Tzu develops black scabs:

  • Take your dog to the vet to check for infections or underlying diseases.
  • Rinse the scab with warm water and use antibacterial cream to prevent infection.
  • Apply anti-itch spray and petroleum jelly or coconut oil to keep the scab moist.
  • Prevent licking or scratching the scab by using a cone or bandage.

Healing times for scabs can vary depending on the severity and cause, but they can generally take anywhere from 3 to 14 days to heal.

Prevention

Prevention is key to managing many health conditions. Regular exercise can help prevent chronic diseases like heart disease and diabetes.

Staying hydrated is essential for maintaining healthy blood sugar levels. Drinking at least eight glasses of water per day can make a big difference.

Eating a balanced diet rich in fruits, vegetables, and whole grains can help prevent nutrient deficiencies. A diet lacking essential nutrients can lead to fatigue, weakness, and other health problems.

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Getting enough sleep is crucial for physical and mental health. Most adults need 7-9 hours of sleep per night to function properly.

Maintaining a healthy weight through a combination of diet and exercise can reduce the risk of chronic diseases. Even a small amount of weight loss can have significant health benefits.

Avoiding sugary drinks and foods high in added sugars can help prevent insulin resistance and type 2 diabetes. Consuming high amounts of added sugars can lead to a range of health problems.

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How to Clean

Cleaning your dog's scabs is an essential step in preventing infection and promoting healing. Use water first to remove loose dirt or debris from the scab, making it a cleaner area to work with.

Disinfecting the scab is also crucial to prevent infection. You can use dog-safe anti-itch or antibiotic sprays, but be sure to consult with your vet for the best options for your pet's needs.

From above of funny shaggy mixed color Shih Tzu with scrunchy sitting on ground and looking at camera during stroll
Credit: pexels.com, From above of funny shaggy mixed color Shih Tzu with scrunchy sitting on ground and looking at camera during stroll

Rinsing the scab with warm water is a simple and effective way to clean it. You can also use a soothing, hypoallergenic aloe & oatmeal dog shampoo to help with inflammation and new cell formation.

Preventing your dog from licking or opening the wound is also important to prevent infection. You can use a cone or ask your vet for advice on how to do this.

Cleaning your dog's scabs regularly can help prevent the formation of new scabs and promote healing. Here's a step-by-step guide on how to clean your dog's scabs:

Frequently Asked Questions

How to treat black skin disease in dogs?

Your veterinarian may prescribe medications such as prednisone, ketoconazole, or leuprolide to help restart hair growth in dogs with black skin disease. These treatments aim to stimulate the growth cycle of hair follicles and improve skin health.

June Weber

Assigning Editor

June Weber is an accomplished Assigning Editor with a passion for storytelling and animal welfare. With a keen eye for compelling narratives, June has successfully assigned articles on a wide range of topics, including the joys and challenges of dog ownership. June's expertise spans multiple categories, including canine breeds such as the Blue Heeler and Mixed Breed Dogs.