·Itching and scratching

Skin diseases can lead to itching in dogs,prompting them to constantly scratch their skin with their paws
If dogs continue to scratch for an extended period, it can result in skin ulceration in severe cases, forming pustules and oozing pus and blood.

·Redness and swelling

Skin diseases can cause itching in dogs, and dogs scratch their skin frequently, resulting in redness and swelling.
Additionally, the inflammation of the skin can also lead to redness and swelling.

·Hair loss

As a result of skin diseases, dogs’ hair follicles in their affected area may be damaged, consequently leading to non-seasonal hair loss.

·Increased dander

Numerous grayish-white or yellowish-brown greasy dander on dogs’ skin can be caused by fungal infections, bacterial infections, external parasite infections, excessive sebum production, and dry weather.

·Fungal infections

Causes:
①Prolonged exposure of fur to moisture without drying
②malnutrition and weak immunity
③contact with infected dogs; unclean living environment.

Symptoms:
①The affected area is typically oval or circular with hair loss and flaking, and has a noticeable border with healthy skin.
② The affected skin appears red and swollen with increased dander,
③ and forms grayish-white scabs that can be easily removed. The removal of scabs reveals smooth skin underneath which does not thicken. Instead, large patches develop, accompanied by itching.

·Bacterial infections

Causes:
Dogs that are bathed too frequently and have weak immunity are more susceptible to infection.

Symptoms:
①Small pimples and pustules will occur on the affected skin,
②generally with severe hair loss, circular bald patches, flaking, scabbing, and tiny inflamed rash.

·Mite infestation (Sarcoptes scabiei and Demodex)

Causes:
①Irregular deworming
②contact with infected dogs
③ weak immunity
④humid and messy environment.

Symptoms:
①Sarcoptes scabiei: At the early stage, symptoms such as redness, itching, and hair loss may occur on the cheeks, the base of ears, and armpits of dogs. In severe cases, herpes may occur; Demodex
② Hair loss and distinct bald patches are primarily observed on areas like around eyelids, the face, the mouth, the lower part of the neck, elbows, and between toes, often accompanied by mild skin redness and dander.

·Skin allergies

Causes:
①Dogs that have a genetic predisposition to allergies
②frequent scratching due to mosquito and insect bites
③ humid living environment.
Skin allergies in dogs can be categorized into allergic dermatitis, urticaria, eczema, etc.

Symptoms:The symptoms of allergies in dogs mainly include itching, hair loss, pimples, redness, scabbing, flaking, redness and swelling of limbs, etc.

·Seborrhea

Causes:
③Damp kennels
④ poor dog body hygiene
⑤high skin surface moisture and low lung function

Symptoms:
①The disease mainly occurs in the head, sometimes starting in the chest, abdomen, armpits, inner thighs and tail base, and then spreads to the whole body.
② The disease initially appears as erythema on the skin, followed by small nodules. In addition, there is a large amount of bran-like desquamation, and the skin becomes hypertrophic, the hair falls off, and the surface is covered with scabs. When the scabs are removed, they appear bright red and moist, often accompanied by bleeding. Thickened skin, especially on the face, neck, and chest, often forming wrinkles
③The dog gnaws, rubs, and is restless all day long, which affects normal food intake and rest. The digestion and absorption functions are reduced, and the dog becomes thinner day by day, followed by failure and even death.