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What type of disease is characterized by excessive itching in animals?

  1. Contagious Disease

  2. Cheyletiellosis

  3. Pneumonia

  4. Ringworm

The correct answer is: Cheyletiellosis

The condition known as Cheyletiellosis is specifically associated with excessive itching in animals. This is caused by a parasitic infestation of Cheyletiella mites, which live on the skin and fur of mammals, leading to significant irritation and a pruritic (itchy) response in affected animals. The clinical signs of Cheyletiellosis include intense scratching, hair loss, and potential secondary skin infections due to the trauma from scratching. While the other options pertain to various health issues in animals, they do not directly relate to excessive itching. Contagious diseases can vary widely in symptoms, pneumonia primarily affects respiratory health without any direct connection to itching, and ringworm, a fungal infection, can cause skin lesions and hair loss but is not primarily characterized by itching to the same extent as Cheyletiellosis. Therefore, when discussing conditions marked by excessive itching, Cheyletiellosis stands out as the most accurate answer.