Mastocytosis in the skin in dogs: A multicentric case series.

Canine cutaneous mastocytosis (CM) is rare in contrast to canine mast cell tumours. In humans, CM commonly affects children and is usually indolent with possible spontaneous resolution. Systemic mastocytosis (SM) with bone marrow involvement typically affects adults, can have a poor outcome, and often includes skin lesions. 'Mastocytosis in the skin' (MIS) is the preferred term of skin lesions, if bone marrow evaluations are not available, which is often the cases in dogs. In human SM and CM, KIT mutations are often detected. The veterinary literature suggests clinical resemblances between human and canine MIS, but data is limited, and KIT mutations are rarely assessed. This retrospective study describes clinicopathological findings, treatment and outcome of 11 dogs with suspected MIS. Dogs with multiple mast cell tumours were excluded. Histopathology reports (n = 5) or slides (n = 6) were reviewed. KIT mutation analysis including exons 8, 9, 11, 14 and 17 were analysed in eight dogs. Median age at diagnosis was 4 years (range, 1-12). Typical clinical signs included multifocal to generalised nodules and papules. Histologically, skin lesions were characterised by dermal infiltration of well-differentiated mast cells. KIT mutations were detected in 3/8 dogs (exon 9: n = 2; exon 11: n = 1). One dog had mastocytaemia suggesting possible SM. Glucocorticoids were mostly successful with lesion improvement in all treated dogs (n = 8). This cohort highlights resemblances between human and canine MIS. Further studies are required to confirm these findings and establish diagnostic criteria for CM and MIS associated with SM in dogs.

Development and validation of an owner-assessed Visual Analog Scale for feline pruritus severity scoring (VAScat).

BACKGROUND: Assessment of the severity of pruritus is difficult in cats, because they manifest discomfort by increased licking, increased scratching or both. HYPOTHESIS/OBJECTIVES: Our objective was to develop and validate a feline-specific pruritus scale (VAScat). METHODS: The scale was designed as a double Visual Analog Scale (VAS), one VAS for licking and one for scratching, with severity and behavioural descriptors. The highest score (VAS-max) on either VAS was taken as the pruritus score for each cat. Owners of 153 cats with skin diseases and of 108 healthy cats scored their pet's pruritus using the VAScat. Ninety-six of 153 cats with skin diseases also were re-evaluated after four to eight weeks of treatment. RESULTS: Pearson's correlation value between VAS-licking and VAS-scratching scores was r = 0.26 (p < 0.01), and Cronbach's alpha was 0.41. Both indexes indicated that the two scales measure different manifestations of pruritus and supported the use of a dual assessing system. Comparison with a numerical pruritus severity scale (0, absent; 1, mild; 2, moderate; 3, severe) suggested that VAS-licking and VAS-scratching scales taken alone are unsuitable for measuring absent to mild pruritus (grades 0-1), while VAS-max is (p = 0.001). VAS-licking, VAS-scratching and VAS-max all were suitable to assess higher levels of pruritus (grades 2-3, p < 0.01). The VAScat was able to measure pruritus improvement following therapy, as post-treatment scores were significantly decreased compared to pre-treatment ones (p < 0.0001). CONCLUSIONS AND CLINICAL IMPORTANCE: The VAScat proved to be a useful tool to assess pruritus in cats and for monitoring the response to treatment for pruritus.

CONTEXTE: L'évaluation de la gravité du prurit est difficile chez les chats, car ils manifestent une gêne par un léchage accru et/ou un grattage accru. Hypothèses/Objectifs : Notre objectif était de développer et de valider une échelle de prurit spécifique au félin (EVAcat). Méthodes : L'échelle a été conçue comme une double échelle visuelle analogique (EVA), une EVA pour le léchage et une pour le grattage, avec des descripteurs de gravité et de comportement. Le score le plus élevé (VAS-max) sur l'un ou l'autre VAS a été pris comme score de prurit pour chaque chat. Les propriétaires de 153 chats atteints de maladies de la peau et de 108 chats en bonne santé ont noté le prurit de leur animal à l'aide du VAScat. Quatre-vingt-seize des 153 chats atteints de maladies de peau ont également été réévalués après quatre à huit semaines de traitement. Résultats : La valeur de corrélation de Pearson entre les scores de léchage VAS et de grattage VAS était de r = 0,26 (p < 0,01) et l'alpha de Cronbach était de 0,41. Les deux indices ont indiqué que les deux échelles mesurent différentes manifestations de prurit et ont soutenu l'utilisation d'un système d'évaluation double. La comparaison avec une échelle numérique de sévérité du prurit (0, absent ; 1, léger ; 2, modéré ; 3, sévère) a suggéré que les échelles EVA de léchage et de grattage prises seules ne conviennent pas pour mesurer le prurit absent à léger (grades 0-1), tandis que VAS-max l'est (p = 0,001). Le léchage VAS, le grattage VAS et le VAS-max étaient tous appropriés pour évaluer des niveaux plus élevés de prurit (grades 2-3, p < 0,01). Le VAScat a pu mesurer l'amélioration du prurit après le traitement, car les scores post-traitement ont été significativement diminués par rapport à ceux avant traitement (p < 0,0001). Conclusions et importance clinique : Le VAScat s'est avéré être un outil utile pour évaluer le prurit chez le chat et pour surveiller la réponse au traitement du prurit.

Introducción- la evaluación de la severidad del prurito es difícil en gatos, porque manifiestan malestar lamiéndose o rascándose más o ambos a la vez. Hipótesis/Objetivos- Nuestro objetivo fue desarrollar y validar una escala de prurito específica para felinos (VAScat). Métodos- La escala fue diseñada como una doble Escala Visual Análoga (EVAS), una VAS para lamido y otras para rascado, con descriptores de severidad y comportamiento. La puntuación más alta (VAS-max) en cualquiera de las VAS se tomó como la puntuación de prurito para cada gato. Los propietarios de 153 gatos con enfermedades de la piel y de 108 gatos sanos calificaron el prurito de sus mascotas con el VAScat. Noventa y seis de 153 gatos con enfermedades de la piel también fueron reevaluados después de cuatro a ocho semanas de tratamiento. Resultados- el valor de correlación de Pearson entre las puntuaciones de VAS-lamerse y VAS-rascarse fue r = 0,26 (p < 0,01), y el alfa de Cronbach fue 0,41. Ambos índices indicaron que las dos escalas miden diferentes manifestaciones de prurito y apoyaron el uso de un sistema de evaluación dual. La comparación con una escala numérica de gravedad del prurito (0, ausente; 1, leve; 2, moderado; 3, severo) sugirió que las escalas VAS-lamerse y VAS-rascarse tomadas solas no son adecuadas para medir el prurito ausente o leve (grados 0-1) , mientras que VAS-max sí que lo es (p = 0,001). VAS-lamerse, VAS-rascarse y VAS-max fueron adecuados para evaluar niveles más altos de prurito (grados 2-3, p < 0,01). El VAScat pudo medir la mejora del prurito después de la terapia, ya que las puntuaciones posteriores al tratamiento se redujeron significativamente en comparación con las anteriores al tratamiento (p < 0,0001). Conclusiones e importancia clínica- El VAScat demostró ser una herramienta útil para evaluar el prurito en gatos y para monitorizar la respuesta al tratamiento del prurito.

Contexto - A avaliação da gravidade do prurido em gatos é difícil, pois eles manifestam desconforto pelo aumento da lambedura, coçam-se mais ou os dois. Hipótese/Objetivos: Nosso objetivo foi desenvolver e validar uma escala de prurido específica para felinos (VAScat). Métodos - A escala foi desenvolvida como uma escala analógica visual (VAS) dupla, uma VAS para lambedura e uma para coceira, com descrição de gravidade e de comportamento. O escore mais alto (VAS-max) em ambas as VAS foi considerado o escore de prurido para cada gato. Donos de 153 gatos com doença de pele e de 108 gatos saudáveis classificaram o prurido dos seus animais utilizando o VAScat. Noventa e seis de 153 gatos com doenças de pele também foram reavaliados após quatro de oito semanas de tratamento. Resultados - O valor de correlação de Pearson entre os escores de VAS-lambedura e o VAS-coceira foi r = 0,26 (p < 0,01), e o alfa de Cronbach foi 0,41. Ambos os índices indicaram que as duas escalas de mensuraram manifestações diferentes de prurido e confirmaram a necessidade do uso de um sistema duplo de avaliação. A comparação com uma escala numérica de gravidade de prurido (0, ausente; 1, leve; 2, moderado; 3, grave) sugeriu que as escalas VAS-lambedura e VAS-coceira isoladamente são ineficazes para a mensuração de prurido ausente a leve (notas 0-1), enquanto o VAS-max é adequado para tal (p = 0,001). VAS-lambedura, VAS-coceira e VAS-max são todas eficazes para avaliar graus de prurido mais altos (notas 2-3, p < 0.01). A VAScat foi capaz de mensurar a melhora do prurido após o tratamento, os escores pós-tratamento foram significativamente menores comparados aos pré-tratamento (p < 0.0001). Conclusões e importância clínica - O VAScat provou ser uma ferramenta útil para avaliar o prurido em gatos e para o monitoramento da resposta ao tratamento para prurido.

Development and validation of a questionnaire to evaluate the Quality of Life of cats with skin disease and their owners, and its use in 185 cats with skin disease.

BACKGROUND: Skin disease can negatively affect the Quality of Life (QoL) of cats and of their owners. OBJECTIVES: To develop and evaluate a questionnaire on QoL of cats with skin disease and their owners. METHODS: Following interviews with owners of cats with severe skin disease and elaboration of a preliminary 19 item questionnaire, a final 15 item (score 0-3) questionnaire was developed. This was administered to owners of 45 cats with allergic dermatitis and 39 healthy cats, to assess its ability to differentiate between diseased and healthy subjects. In allergic cats, owners evaluated overall disease severity (S) and pruritus with a Visual Analog Scale (VAS); veterinarians evaluated skin lesions [SCORing Feline Allergic Dermatitis (SCORFAD) and Feline Dermatitis Extent and Severity Index (FeDESI)]. The correlation with QoL was analysed by Spearman's rank test. In 31 allergic cats, SCORFAD, FeDESI, pruritus VAS, S and QoL scores were obtained before and after therapy, and their improvement evaluated statistically. RESULTS: QoL scores in allergic cats were significantly higher than in healthy cats (P=<0.0001). Severity correlated well and significantly with both cat's and owner's QoL (r = 0.51 and 0.64, P = 0.0003 and <0.0001, respectively). Correlation of QoL with pruritus VAS was moderate and significant (r = 0.3, P = 0.03), whereas with SCORFAD and FeDESI it was low and not significant. With therapy all scores decreased significantly (P < 0.0001); however, QoL was not influenced by improvement of clinical scores. Questions related to the burden of therapy showed the smallest improvements. CONCLUSIONS: This QoL questionnaire could be a useful tool in evaluating cats with skin disease.

Pustular dermatitis in dogs affected by leishmaniosis: 22 cases.

BACKGROUND: Skin lesions in canine leishmaniosis (CanL) are diverse, including exfoliative, ulcerative, nodular and papular dermatitides. An uncommon pustular form has also been reported. HYPOTHESES/OBJECTIVES: We hypothesized that CanL infection can produce a pustular reaction pattern in the skin of dogs. The aim of this retrospective study was to describe the clinicopathological features of dogs with CanL infection and pustular dermatitis, and correlate them with response to therapy. ANIMALS: Twenty two affected dogs. METHODS: Retrospective review of medical records and examination of archived biopsy materials or previously processed glass slides was performed. Cytological examinations had been recorded for all cases. Specimens were available for histopathological examination in 17 of 22 cases and for immunohistochemical detection of Leishmania amastigotes in 13 of 22 cases. RESULTS: All dogs presented with multifocal to diffuse pustular dermatitis. CanL was diagnosed by IFAT serology (20 cases), bone marrow cytology (one case) or bone marrow PCR (one case). Cytological and/or histopathological examinations revealed acantholytic keratinocytes within pustules in 18 of 22 cases. Bacterial and fungal cultures were not performed. Leishmania amastigotes were identified by histopathology within the dermis in three cases; immunohistochemistry was positive in four cases. All dogs underwent concurrent anti-leishmanial and immunosuppressive therapy to control the pustular dermatitis, with favourable outcome in 11 of 22 cases. CONCLUSIONS AND CLINICAL IMPORTANCE: Due to the retrospective nature of this study it is not possible to either accept or reject the hypothesis that CanL is the direct cause of pustular dermatitis.

Effectiveness of a combined (4% chlorhexidine digluconate shampoo and solution) protocol in MRS and non-MRS canine superficial pyoderma: a randomized, blinded, antibiotic-controlled study.

BACKGROUND: There is a lack of studies comparing topical antiseptics to systemic antibiotics in the treatment of canine superficial pyoderma. HYPOTHESIS/OBJECTIVES: To compare the efficacy of topical chlorhexidine with systemic amoxicillin-clavulanic acid for the treatment of canine superficial pyoderma. ANIMALS: A randomized controlled trial was conducted in dogs with superficial pyoderma. Group T (n = 31) was treated topically with 4% chlorhexidine digluconate shampoo (twice weekly) and solution (once daily) for 4 weeks. Group S (n = 20) was treated orally with amoxicillin-clavulanic acid (25 mg/kg) twice daily for 4 weeks. METHODS: Bacterial culture and susceptibility testing were performed on clinical specimens collected before treatment. Severity of lesions and number of intracellular bacteria were evaluated using four-point scales to calculate a total pyoderma score for each dog. Pruritus was assessed by owners using a visual analog scale (range 0-10). Scores were analysed for statistical differences between groups T and S. RESULTS: Staphylococcus pseudintermedius was isolated from 48 dogs, including eight meticillin-resistant strains (MRSP). Although the number of dogs was small, no significant differences in pyoderma and pruritus scores were observed between groups throughout the study except for day 1, when group S had a significantly higher total score than group T (P = 0.03). Treatment with chlorhexidine products resulted in resolution of clinical signs in all dogs including those infected with MRSP. CONCLUSION AND CLINICAL IMPORTANCE: Topical therapy with chlorhexidine digluconate products may be as effective as systemic therapy with amoxicillin-clavulanic acid. This finding supports the current recommendations to use topical antiseptics alone for the management of superficial pyoderma.

Oclacitinib in feline nonflea-, nonfood-induced hypersensitivity dermatitis: results of a small prospective pilot study of client-owned cats.

BACKGROUND: Oclacitinib is a Janus kinase inhibitor that decreases pruritus and lesions in allergic dogs. In cats, it is able to inhibit interleukin-31-induced pruritus; no information is available on its clinical effectiveness. HYPOTHESIS/OBJECTIVES: To evaluate the efficacy, ease of administration and tolerability of oclacitinib in feline nonflea-, nonfood-induced hypersensitivity dermatitis. METHODS: Cats >12 months of age and >3 kg body weight with a diagnosis of nonflea-, nonfood-induced hypersensitivity dermatitis were treated with oclacitinib, 0.4-0.6 mg/kg orally (p.o.) twice daily for 2 weeks, then once daily for an additional 14 days. Clinical lesions were evaluated with the Scoring Feline Allergic Dermatitis (SCORFAD) system and pruritus was evaluated with a 10-cm-long visual analog scale (VAS) before and at the end of the study. Owners assessed global efficacy, ease of administration and tolerability with a four-point scale. RESULTS: Twelve cats were treated with a mean initial oclacitinib dose of 0.47 mg/kg p.o. twice daily. There was good improvement in SCORFAD and VAS pruritus scores in five of 12 cases, while the other cats were unchanged, deteriorated or dropped out due to treatment failure. Owners scored global efficacy as good/excellent in four of 12 cases and ease of administration and tolerability as good/excellent in 10 of 12. CONCLUSIONS AND CLINICAL IMPORTANCE: Oclacitinib at 0.4-0.6 mg/kg p.o. may be an effective and safe drug for some cats with nonflea-, nonfood-induced hypersensitivity dermatitis. Further studies are needed to identify the most effective dose range for this species.

Proliferative and necrotising otitis externa in a cat without pinnal involvement: video-otoscopic features.

Proliferative and necrotising otitis externa is a rare and recently described disease affecting the ear canals and concave pinnae of kittens. This article describes a case of proliferative and necrotising otits externa in a young adult cat. In this case, the lesions did not affected the pinnae, but both ear canals were severely involved. Video-otoscopy revealed a digitally proliferative lesion, growing at 360° all around the ear canals for their entire length, without involvement of the middle ear. Histopathological examination confirmed the diagnosis, and the cat responded completely to a once-daily application of 0.1% tacrolimus ointment diluted in mineral oil in the ear canals. Video-otoscopy findings, not described previously, were very peculiar and may help clinicians to diagnose this rare disease.