Ringworm (dermatophytosis) is a highly contagious fungal skin infection in cats that causes significant welfare impacts and is a major challenge in shelter environments.
Ringworm causes genuine physical discomfort - itching, skin irritation, and hair loss that leaves cats vulnerable to secondary infections. In severe cases, large areas of skin may be affected with extensive lesions. However, the biggest welfare issue with ringworm is often the shelter system response: cats diagnosed with ringworm have historically faced euthanasia in high-volume shelters without resources for treatment. Modern approaches treat ringworm as a manageable, curable condition rather than a death sentence. The 6-8 weeks required for treatment is a significant burden for shelter capacity, but innovative approaches including foster-based treatment programs have dramatically improved outcomes for ringworm-positive shelter cats.