1887

An approach to symmetrical alopecia in the dog

image of An approach to symmetrical alopecia in the dog
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Abstract

The causes of alopecia in dogs are numerous and include infections, self-inflicted hair loss, endocrinopathies and follicular dysplasias. This chapter is restricted to cases of non-pruritic canine symmetrical alopecia. Hair growth is influenced by, amongst other factors, gonadal, adrenal, thyroid, pituitary and pineal hormones. Excesses, deficiencies and hormonal imbalances have been incriminated in a myriad of clinical syndromes in dogs. In some endocrinopathies (e.g. hypothyroidism, hyperadrenocorticism, hyperoestrogenism and pituitary dwarfism) the hormonal mechanisms are understood and these disorders are relatively well characterized clinically. Many other alopecic disorders may resemble endocrinopathies clinically (e.g. canine recurrent (seasonal) flank alopecia, alopecia X, colour dilution alopecia and other follicular dysplasias) but, in many instances, the final diagnosis can be more difficult to establish. The chapter looks at Clinical approach; Congenital alopecia; Endocrinopathies; Follicular dysplasias; and Miscellaneous conditions.

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Figures

Image of 13.1
13.1 Evaluation of canine alopecia.
Image of 13.4
13.4 Peruvian Hairless Dog. Chinese Crested Dog.
Image of Hypothyroidism in a Golden Retriever. (a) Tragic face with myxoedema. (b) Alopecia and hyperpigmentation of the bridge of the nose. (c) Alopecia of the tail.
Hypothyroidism in a Golden Retriever. (a) Tragic face with myxoedema. (b) Alopecia and hyperpigmentation of the bridge of the nose. (c) Alopecia of the tail. Hypothyroidism in a Golden Retriever. Tragic face with myxoedema. Alopecia and hyperpigmentation of the bridge of the nose. Alopecia of the tail.
Image of Pituitary-dependent hyperadrenocorticism in a Boston Terrier, showing alopecia and pot-bellied appearance.
Pituitary-dependent hyperadrenocorticism in a Boston Terrier, showing alopecia and pot-bellied appearance. Pituitary-dependent hyperadrenocorticism in a Boston Terrier, showing alopecia and pot-bellied appearance.
Image of Hyperadrenocorticism in a mixed-breed dog. Note the alopecia and thin abdominal skin showing dermal blood vessels.
Hyperadrenocorticism in a mixed-breed dog. Note the alopecia and thin abdominal skin showing dermal blood vessels. Hyperadrenocorticism in a mixed-breed dog. Note the alopecia and thin abdominal skin showing dermal blood vessels.
Image of Specific laboratory procedures to evaluate pituitary and adrenal gland function in suspected cases of canine hyperadrenocorticism.
Specific laboratory procedures to evaluate pituitary and adrenal gland function in suspected cases of canine hyperadrenocorticism. Specific laboratory procedures to evaluate pituitary and adrenal gland function in suspected cases of canine hyperadrenocorticism.
Image of Pituitary dwarfism in a 1.5-year-old German Shepherd Dog bitch.
Pituitary dwarfism in a 1.5-year-old German Shepherd Dog bitch. Pituitary dwarfism in a 1.5-year-old German Shepherd Dog bitch.
Image of (a) Yorkshire Terrier with colour dilution alopecia affecting the blue area of the body. (b) Chihuahua showing alopecia on the head and ear pinnae, with normal hair coat in the brown areas.
(a) Yorkshire Terrier with colour dilution alopecia affecting the blue area of the body. (b) Chihuahua showing alopecia on the head and ear pinnae, with normal hair coat in the brown areas. Yorkshire Terrier with colour dilution alopecia affecting the blue area of the body. Chihuahua showing alopecia on the head and ear pinnae, with normal hair coat in the brown areas.
Image of Canine recurrent flank alopecia in (a) a Boxer and (b) a Mastiff.
Canine recurrent flank alopecia in (a) a Boxer and (b) a Mastiff. Canine recurrent flank alopecia in a Boxer and a Mastiff.
Image of Pomeranian with alopecia X showing hair loss (a) around the neck and (b) on the rump. (c) The same dog after melatonin treatment.
Pomeranian with alopecia X showing hair loss (a) around the neck and (b) on the rump. (c) The same dog after melatonin treatment. Pomeranian with alopecia X showing hair loss around the neck and on the rump. The same dog after melatonin treatment.
Image of Portuguese Water Dog with follicular dysplasia affecting the trunk.
Portuguese Water Dog with follicular dysplasia affecting the trunk. Portuguese Water Dog with follicular dysplasia affecting the trunk.
Image of Miniature Pinscher with pattern alopecia affecting (a) the ventral chest and (b) the caudomedial aspect of the thighs.
Miniature Pinscher with pattern alopecia affecting (a) the ventral chest and (b) the caudomedial aspect of the thighs. Miniature Pinscher with pattern alopecia affecting the ventral chest and the caudomedial aspect of the thighs.
Image of Boston Terrier with pattern alopecia affecting the ventral chest (a) before and (b) after melatonin administration.
Boston Terrier with pattern alopecia affecting the ventral chest (a) before and (b) after melatonin administration. Boston Terrier with pattern alopecia affecting the ventral chest before and after melatonin administration.

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