There are black patches on the dog's skin. It may be due to excessive accumulation of melanin in the dog's body and black patches will appear. This indicates that the dog is relatively healthy, because this is related to the dog's diet or outdoor exercise. It may also be caused by a fungus infection on the dog's skin. In addition to black patches, dogs are generally accompanied by symptoms such as skin itching, redness and swelling. It is recommended to take the dog to the pet hospital for examination in time. According to the fungus's Type targeted treatment.

What are the skin diseases of dogs:

1. Dogs are allergic. There are many types of dog allergies. It may be a chronic allergy. The dog will have rashes, itching, hair loss, red and swollen ears, etc. in certain parts of the dog. If it has a food allergy, its skin will also have a rash; if it is a drug, Allergies usually cause rashes and itching all over the body. Severe cases can lead to death. You need to see a doctor immediately.

2. Bacterial dermatitis. Hair loss, rash, pustules, or increased bloody discharge on the body.

3. Fungal dermatitis. Large areas of hair loss appear in a round or oval shape, with scabs that fall off easily. After shedding, the skin becomes smooth and large areas of moss will form.

4. Scabies mites. In the early stage, erythema, papules or small nodules appear on the skin. The initial sites where scabies mites appear are usually on the dog's head, chest, armpits, and tail base. In severe cases, it can develop into a systemic disease.