Canine Flank Alopecia (PDF Document )

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Canine Flank Alopecia (PDF Document )
Specialist Referral Service
Willows Information Sheets
Canine Flank Alopecia
Willows Information Sheets
T: 0121 712 7070
www.willows.uk.net
Canine Flank Alopecia
What is canine flank alopecia?
Canine flank alopecia is a localised, often cyclic, disease of the hair follicles resulting in hair loss
over the flanks of affected dogs. It is also known by the names cyclic flank alopecia, recurrent flank
alopecia and seasonal flank alopecia, but these terms are not always accurate as the condition can
appear at various times of the year, vary in duration, be continuous or be sporadic in nature.
What causes flank alopecia?
The cause of this condition is not known. However, as hair loss often occurs at times of the year
when day length is at its shortest, light exposure may be involved. The mechanisms by which this
might occur are not understood at present.
© WILLOWS VETERINARY CENTRE AND REFERRAL SERVICE
Willows Information Sheets
T: 0121 712 7070
www.willows.uk.net
What are the clinical signs?
How is it diagnosed?
Canine flank alopecia occurs in dogs with ages ranging from 1 year
to 11 years, although most cases develop between 3 and 6 years.
This condition is seen more commonly in breeds such as Boxers,
Airedale terriers, English Bulldogs and Schnauzers.
The diagnosis of canine flank alopecia can often be made based
on the clinical findings, since the lesions are so striking. Some
hormonal diseases of dogs can present with non-itchy hair loss, so
blood and urine tests may be warranted if there is a concern about
these diseases.
The condition causes areas of non-itchy hair loss over the flanks
of affected dogs (Figure 1). The skin at the affected sites usually
appears normal, although it often becomes very dark with
pigmentation, and hair re-growth of a different colour sometimes
occurs. Surrounding hair and skin is usually normal. Canine flank
alopecia can occur on both sides of the dog or be limited to one side,
and hair loss can also occur over the base of the back (Figure 2).
The disease in some dogs is cyclic, with hair loss occurring at the
same time each year and hair re-growth occurring in the times
between. In other dogs, hair loss is more permanent, and no regrowth is seen following the initial loss. Some dogs are reported as
only having one cycle of hair loss and re-growth in their lives.
Additionally, biopsies of affected skin can be taken which are then
sent off for analysis at a laboratory. Biopsies can be supportive of a
diagnosis of canine flank alopecia.
What are the treatments available?
Canine flank alopecia is a cosmetic disease. As dogs remain healthy,
with many re-growing their hair eventually, a decision not to treat
the affected dog is often taken.
If treatment is requested, melatonin is generally considered the
treatment of choice as it is relatively safe and inexpensive. It is
difficult to judge the response to medication though due to the high
rate of spontaneous hair re-growth.
What is the outlook/prognosis?
The prognosis for this cosmetic disease is good, with dogs remaining
systemically healthy despite unpredictable hair growth. The
prognosis for full and normal hair re-growth at affected sites is also
often good, but the disease is highly variable.
Why should I bring my pet to Willows?
Figure 1
Patchy hair loss on the flank of a Boxer dog with
canine flank alopecia
Our dermatology service is led by a recognised, accredited Specialist
and we aim to provide the best possible care and treatment for your
pet in our state-of-the art hospital. Our dermatologist works closely
with Specialists in the disciplines of Internal Medicine, Orthopaedics,
Soft Tissue Surgery, Neurology, Ophthalmology, Oncology
and Anaesthesia and the hospital provides 24-hour veterinary
and nursing care to ensure the best possible outcome in each
and every case.
If you have any queries or concerns, please do not hesitate
to contact us.
Figure 2
Hair loss over the flank and base of the back in a
Golden Retriever with canine flank alopecia
© WILLOWS VETERINARY CENTRE AND REFERRAL SERVICE
Specialist Referral Service
www.willows.uk.net
The information contained is proprietary to Willows Veterinary Centre
& Referral Service and may not be modified, reproduced, distributed
or utilised in any manner in whole or in part, without the express prior
written permission of Willows Veterinary Centre & Referral Service.

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