17/08/2026
Bệnh ghẻ(ký sinh trùng trên da thú cưng).
sarcoptic mange (scabies) with demodectic mange (red mange) in dogs. For sarcoptic mange, the important points are:
🐶 Sarcoptic Mange (Canine Scabies)
Causative agent: Sarcoptes scabiei var. canis — a microscopic mite that lives mainly in the superficial layers of the skin.
🔬 A — Mite and burrowing
The female Sarcoptes mite burrows into the superficial stratum corneum, forming tunnels and laying eggs. The mites, eggs and f***l material trigger a strong hypersensitivity reaction.
🕷️ B — Highly contagious and intensely itchy
Sarcoptic mange is highly contagious, mainly through close contact with an affected dog. Environmental transmission can also occur, although direct contact is the major route.
The hallmark clinical sign is severe, persistent pruritus (itching).
🔴 C — Typical lesions
Common lesions include:
* Severe itching and scratching
* Papules and erythema
* Hair loss (alopecia)
* Crusting and scaling
* Excoriations from scratching
* Thickened skin in chronic cases
Typical sites are the ear margins, elbows, hocks, ventral abdomen, chest and limbs. The photo correctly illustrates lesions around the chest/ventral body, although sarcoptic lesions can occur elsewhere.
⚠️ Important correction about the picture
The statement “mites push waste behind them and clog follicles” is not an accurate description of sarcoptic mange. Sarcoptes mites do not primarily live in hair follicles.
Instead:
Sarcoptes → superficial epidermis/stratum corneum → burrows and tunnels
Whereas:
Demodex → hair follicles and sebaceous glands
🩺 Diagnosis
Diagnosis can be challenging because the number of mites may be very low.
Common methods include:
* Superficial skin scraping from active lesions
* Examination for mites, eggs or f***l material
* Pinnal-pedal reflex may support suspicion but is not diagnostic
* Response to appropriate acaricidal treatment may support the diagnosis when mites cannot be demonstrated
A negative skin scraping does not rule out sarcoptic mange.
💊 Treatment
Modern treatment commonly uses effective acaricidal drugs, particularly the isoxazoline class (for example, sarolaner, afoxolaner, fluralaner or lotilaner), according to the individual product’s veterinary label and dosing schedule.
Other appropriately labeled acaricides may also be used.
Because the disease is contagious:
* Treat all in-contact dogs when indicated.
* Wash bedding and clean the environment.
* Manage secondary bacterial or yeast infections when present.
* Continue treatment according to the recommended schedule rather than stopping once itching improves.
👨⚕️ Zoonotic importance
Sarcoptes scabiei from dogs can cause temporary itchy skin lesions in humans after exposure. Human infestation generally does not persist as it does in canine scabies, but affected owners may develop pruritic papules.
