The dog's strange appearance is sick, which may be caused by many reasons. One possibility is that dogs are infected with parasites, such as fleas and mites, which can cause discomfort and itching in dogs. Another possibility is that dogs suffer from skin diseases, such as eczema and fungal infections. These diseases can lead to redness, depilation, itching and other symptoms in dogs. In addition, dogs may suffer from other diseases, such as gastrointestinal problems and respiratory problems. These diseases can lead to loss of appetite, vomiting, diarrhea, cough and other symptoms.

In order to ensure the dog's health, it is suggested that the owner take the dog to the vet for physical examination regularly, including deworming, vaccination, skin examination and gastrointestinal examination. At the same time, the owner should also pay attention to provide enough food and water for the dog, keep the dog's body clean and hygienic, and avoid the dog from contacting harmful substances and pathogens. If the dog has abnormal symptoms, the owner should take the dog to the vet for treatment in time.