Causes of hair loss in pet dogs

1. Scabies: caused by scabies mites or demodex mites. Scabies mites mainly occur on the head (bridge of the nose, eye sockets, auricles and their roots), and sometimes on the chest, abdomen, armpits, inner thighs and tail, and even spread to the whole body. The skin surface is flushed with rash-like nodules, the subcutaneous tissue is thickened, and the affected skin becomes hairless due to frequent scratching, friction, and biting.

2. Lice disease: It is itching and skin irritation caused by lice parasitism, which leads to scratching, friction and biting. The coat of the affected area is rough and dull, and is easy to break and fall off. In particular, the parasitism of hair lice can cause a large amount of hair loss in dogs, and a large amount of shed hair can be found in places where dogs frequently move.

3. Hookworm disease: The affected dog is emaciated, has pale conjunctiva, rough and matte coat that is easy to break and fall off. Hair loss spots of varying sizes often appear on the back, exposing the skin, and papules or scabs appear on the skin. Skin. Sick dogs have loss of appetite, vomiting, heterophilia, diarrhea and constipation alternately, and their feces are bloody or black with a rancid smell.

4. Trichophyton alopecia: It is a fungal disease mainly caused by Microsporum and Trichophyton in dogs. The course of the disease is long. Round or irregular bald spots appear on the skin, covered with gray-white scales. They are more common on the head, neck and limbs. In severe cases, they can form one patch and affect most of the body surface. Sometimes accompanied by dermatitis, papules or pustules.

5. Estrogen secretion disorder: It is more common in adult female dogs that have not been neutered. It is characterized by excess estrogen secretion, itching all over the affected dog's body, hair loss (generally symmetrical hair loss), and skin pigmentation. Some sick dogs have swollen vaginas and bleeding-like secretions, showing symptoms of persistent estrus.

6. Canine acanthosis nigricans: The cause is still unclear. Most people believe that it is related to the hormone secretion disorder in dogs. It is more common in old, weak and sick dogs. The skin symptoms are similar to estrogen secretion disorder, with symmetrical hair loss. , pigmentation, and skin thickening are the main symptoms. At the same time, there is oil-like exudation on the skin, but no itching symptoms.

7. Vitamin deficiency: Vitamin B deficiency can also cause hair loss, as well as symptoms such as weight loss, anorexia, general weakness, and vision loss or loss.