Ringworm in Dogs: Tackling the Fungus Among Us

Dogs, just like humans, can be affected by ringworm, a fungal infection that manifests as red, circular lesions on the skin. It is a highly contagious condition that can spread to other pets as well as humans. However, with prompt diagnosis and treatment, ringworm in dogs can be easily managed. This article discusses the causes, symptoms, and treatment of ringworm in dogs.

What Causes Ringworm in Dogs?

Ringworm is caused by a group of fungi known as dermatophytes. These fungi thrive in warm and humid environments and can survive in soil, clothing, bedding, and other contaminated surfaces for up to a year. Ringworm can spread through direct contact with an infected animal or indirect contact with contaminated items.

Other risk factors include:

  • A weakened immune system
  • Poor nutrition
  • Youth or old age
  • Poor hygiene and grooming
  • Living in overcrowded and unsanitary conditions

Signs and Symptoms of Ringworm in Dogs

The symptoms of ringworm in dogs vary depending on the severity and location of the infection. However, some of the common signs to watch out for include:

  • Red, circular lesions
  • Crusty, scaly, or flaky skin
  • Bald patches on the skin
  • Itchy or irritated skin
  • Darkened or discolored skin
  • Blisters or pustules
  • Inflamed, swollen, or tender skin

However, it is important to note that some dogs may not show any symptoms even when they are carriers of the infection.

Diagnosis of Ringworm in Dogs

If you suspect that your dog has ringworm, it is important to visit a veterinarian for proper diagnosis and treatment. The diagnosis of ringworm in dogs usually involves:

  • Physical examination of the affected area
  • Skin scrapings and cultures
  • Wood’s lamp examination

The veterinarian may also need to run some blood tests to rule out other possible conditions.

Treatment for Ringworm in Dogs

The treatment for ringworm in dogs typically involves a combination of topical and oral antifungal medications. The duration of treatment may vary depending on the severity of the infection, but it usually takes between 6-12 weeks.

  • Topical antifungal medications such as shampoos, sprays, or creams can be applied directly to the affected skin. They work by killing the fungus or inhibiting its growth. It is important to follow the instructions on the label and use the medication as directed.
  • Oral antifungal medications such as terbinafine, itraconazole, or fluconazole can also be prescribed to treat ringworm in dogs. These medications work by circulating in the bloodstream and killing the fungus from the inside out. However, they may come with some side effects such as vomiting, diarrhea, or liver damage.
  • In severe cases, the veterinarian may recommend shaving the affected hair and using a lime sulfur dip to kill the fungus.

Prevention of Ringworm in Dogs

Ringworm in dogs can be prevented by taking some simple steps such as:

  • Keeping your dog clean and well-groomed
  • Regularly washing your dog’s bedding, toys, and other items
  • Avoiding overcrowded and unsanitary living conditions
  • Avoiding contact with infected animals or contaminated surfaces

You should also take your dog for regular checkups to detect and treat any underlying medical conditions that may weaken the immune system.


Ringworm in dogs is a common fungal infection that can be easily managed with prompt diagnosis and treatment. It is important to visit a veterinarian if you suspect that your dog has ringworm. With proper treatment and prevention measures, your dog can recover from ringworm and lead a healthy life.

Common Questions and Answers about Ringworm in Dogs

  • Q: Is ringworm in dogs contagious to humans?
  • A: Yes, ringworm in dogs is contagious to humans. You should take proper hygiene measures when handling an infected dog.
  • Q: Can I use over-the-counter antifungal medications to treat ringworm in dogs?
  • A: No, you should never use over-the-counter antifungal medications to treat ringworm in dogs without the guidance of a veterinarian. Some of these medications may be toxic to dogs.
  • Q: Can I prevent ringworm in dogs by bathing them frequently?
  • A: No, bathing your dog frequently may actually increase the risk of ringworm infection by stripping the skin of its natural oils. You should bathe your dog only when necessary and with a gentle, pet-friendly shampoo.


1. Mancianti, F. (2017). Dermatophytoses in domestic animals. In Dermatophyte Infections (pp. 87-120). Springer, Cham.

2. Affolter, V. K., Fontenelle, J. P., & Pavletic, M. M. (2014). Cutaneous fungal infections. Veterinary Clinics: Small Animal Practice, 44(4), 723-738.

3. Moriello, K. A., & Newbury, S. (2016). Fungal skin infections in dogs. Veterinary Clinics: Small Animal Practice, 46(5), 853-869.

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