ANSC
Dermatology part 1 2016 NT CS.pptx

Dermatology part 1 2016 NT CS.pptx - Canine and Feline...

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Canine and Feline Dermatologic Disease Large percentage of small animal clinical practice Pyoderma Otitis Externa Aural Hematomas Abscesses Allergic dermatitis Dermatophytes Ectoparasites Anal sacs 1
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Integument intro: Skin largest organ 12-24% of body weight Skin functions: Thermoregulation Vitamin D metabolism Sebum (natural oil) Sweat glands Skin layers: Epidermis (outer layer) Dermis (80%) Hypodermis (fatty layer)
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Dermatitis Definition : inflammation of the skin Can be associated with systemic disease Causes of skin inflammation : External irritants Burns Allergies Trauma Infection Pruritis: itchiness
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Bacterial Pyoderma •. Any skin disease accompanied by the production of pus Usually are bacterial skin infections and secondary to another problem •. Bacterial pyoderma caused by the overgrowth of resident or transient bacteria Most commonly isolated bacteria in dogs and cats: Staphylococcus pseudintermedius a NORMAL inhabitant of skin, mucous membranes, carriage sites(nares, throat, groin,anus) “opportunistic” •. Most common clinical sign in dogs and cats: excessive scaling 4
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Causes of pyoderma 1. Allergic diseases 2. Parasites 3. Seborrhea 4. Hormonal imbalances 5. Immunosuppresion(natural or iatrogenic) SO…..we need to treat the primary cause, not just the symptoms!
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Types of pyoderma 1. Surface -allergies #1 cause Mucocutaneous Fold pyoderma Bulldogs, Pugs, Bostons…..face, tail folds Superficial Hot spots Secondary to sarcoptic mange, external parasites Secondary to endocrine imbalances Hypothyroidism, cushing’s disease 6
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Superficial pyoderma (superficial bacterial folliculitis) infection limited to the epidermis and hair follicles Most commonly caused by fleas, FAD, food allergy, atopy, hypothyroidism Clinical signs: in cats, scaling over lumbar region 7
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Puppy Pyoderma “puppy acne” Mild, localized pustules that rupture and form crusts Look like pimples or ant bites Clinical signs/patterns: usually on hairless parts of belly puppies receive an "inoculation" immediately after birth from the bitch's oral cavity (licking) 8
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Moist Pyoderma Warm, humid weather Break in the skin and moisture-from a swim, bath-creates a nice environment for bacteria Rapidly grow/spread Dogs with dirty, matted hair coats at risk Usually painful Rarely seen in cats 9
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Hot Spots/Moist Pyoderma Causes : Saliva accumulation under a hair coat can result in hot spots Staphylococcus pseudintermedius always near the mouth not usually contagious to people
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Hot Spots 11
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Types of pyoderma 2. Deep pyoderma - demodex #1 cause Dermis Rupture of hair follicle Subcutis may be involved Other examples: Genetic-germ. Shep Elbow callus pyoderma Secondary to grooming(trauma or contaminated products- shampoos) Secondary to cutaneous lymphoma Clinical signs : Frunculosis(painful nodules) Cellulitis Erosions Ulcers ***PAIN****
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