Demodex mites live on all dogs in small numbers. Most of the time they don’t cause a problem and you won’t even know they’re there. If a dog becomes immunosuppressed (loses the ability to fight off infections and parasites) demodex mites are able to multiply and invade the skin. This is most likely to happen to dogs less than a year old and dogs with other illnesses.
Demodex causes red, crusty skin, hair loss and a scaly coat, worst around the eyes and feet. Demodex is normally quite simple to diagnose but treatment can be challenging.
Call your vet for an appointment if your dog has signs of a skin problem. If your dog has had demodex previously, you will need to keep checking for signs of it returning.