What may at first appear to be a simple case of dry skin may actually be a more serious issue which may require testing for diagnosis and treatment via prescribed oral medications and/or medicated shampoos or topical treatments.
Possible issues include:
Eczema.
Canines can develop both wet eczema (discharge oozes from the skin) and dry eczema (skin is very puckered, tender, and wrinkled). Other symptoms of this include severe itchiness, discomfort, skin crusts, skin discoloration, thickened skin, and/or open sores.
Eczema can develop if dry skin is not properly treated, however rother causes include
allergies, vitamin deficiency, bacterial or fungal infection, and exposure to irritating substances.
Psoriasis.
Canines can develop psoriasis, though it is more common with some breeds more than others such as the Golden Retriever and West Highland Terrier. The main signs are thick red skin scales that typically appear most often on the head, elbows, legs, and lower back near the base of the tail and chronic itching.
Psoriasis is caused by an autoimmune disorder in which health skin cells are attacked leading to abnormalities.
Seborrhea.
This is a condition that leads to dandruff and greasy skin that usually emits a strong unpleasant odor. The overly greasy areas typically appear in or around the ears, belly, armpits, and lower legs. Other signs include severe itching, scratching to the point of bleeding, and/or hair loss.
This may be genetic (the Maltese is not one of the breeds prone to this), idiopathic (arising spontaneously), or linked to other conditions including allergies, hormonal disorders, vitamin deficiency, and parasites.