Chrissy, a healthy middle aged dachshund,
was presented with the skin lesions seen below. These were large
round spreading patches of hair loss with a little scaling and dark
pigmentation of their centres. The affected skin was slightly but
not very itchy.
Diagnosis of skin problems in dogs and cats is made
difficult by the fact that many conditions can look very similar.
These may have very different causes and require very different
treatments.
In this case for example the possible causes include:
Ringworm ; a fungal skin
infection.
Demodectic mange; a skin
mite living in the hair follicle
Physical damage such as heat
or chemical contact.
Autoimmune skin disease;
where the body damages itself.
Malassezia a yeast infection.
Investigation of skin conditions can involve the
following:
A thorough detailed history of
how the problem developed
A close inspection of the lesions.
Skin scrapings to look for mites
living in the skin
Cytology to look at skin cells
under the microscope
In some cases blood sampling for
hormonal problems or allergies.
In this case a diagnosis of superficial pyoderma
was made. Treatment with a 3 week course of a strong skin active
antibiotic and an antibacterial shampoo cured the problem and
the hair was soon regrowing.
Pyoderma is a common skin condition in dogs. However
it can look quite different depending on the breed of dog , place
on the body and severity of the infection. It is commonly a secondary
condition in adult dogs with the primary initiating
condition being allergic. Allergies can be caused by parasites,
food or airborn allergens such as dust and pollen to name just
a few; but thats another huge story! watch this space.