image of Ectoparasites
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Ectoparasite infestation is a relatively common cause of skin disease in domesticated animal species, and the most frequently observed offender is , or the cat flea. This chapter summarizes the diseases caused by, and the treatment of Acari (sarcoptid, cheyletiellid, neotrombiculid, otodectid and notoedrid mites; ticks) and insects (lice, biting flies and mosquitoes). Flea allergic dermatitis is covered in Chapter 20, and demodicosis is discussed in Chapter 22. The following topics are considered: Acari; and Insecta.

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21.1 Bilateral periocular alopecia, erythema and lichenification in an adult male crossbreed dog with sarcoptic mange. Left pinna of a male Lhasa Apso with advanced sarcoptic mange. Note the marked degree of hyperkeratosis and scaling, particularly around the pinnal margin. Hocks of an adult male German Shepherd Dog affected by sarcoptic mange. Generalized sarcoptic mange in an English Bull Terrier bitch.
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21.2 Microscopic appearance of . Adult mite in liquid paraffin. (Original magnification x100) Ova and faeces (scybala) in liquid paraffin (Original magnification x400)
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21.4 Microscopic appearance of spp. Mite harvested from a canine skin scraping, suspended in liquid paraffin. Note the distinctive crescentshaped hooks on the accessory mouthparts. (Original magnification x100) Ovum in liquid parrafin. Note the thread attaching the egg to the hair. (Original magnification x400)
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21.5 Severe scaling and erythema in an adult Newfoundland with cheyletiellosis.
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21.6 Papular lesions on the forearm of the owner of a dog infested with mites. (Courtesy of M Paradis)
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21.7 Left ear of a mature Shih Tzu bitch showing the presence of an accumulation of red-orange larvae (arrowed) in the cutaneous marginal pouch (also known as ‘Henry’s pocket’).
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21.8 A six-legged larva harvested by skin scraping and suspended in liquid paraffin. (Original magnification x100)
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21.9 Microscopic appearance of an larval mite suspended in liquid paraffin. (Original magnification x100)
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21.10 Microscopic appearance of the canine biting louse , suspended in liquid paraffin. (Original magnification x100) and the canine sucking louse , suspended in liquid paraffin. (Original magnification x100)
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21.11 Microscopic appearance of a hair plucking suspended in liquid paraffin, showing multiple louse eggs cemented on to the hair shafts. (Original magnification x100)

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