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Leptospirosis, caused by Leptospira spp., is a zoonotic bacterial disease important to both human and animal health. Six pathogenic serovars are currently known to commonly infect and cause disease in dogs in the United States. While canine leptospirosis infection is historically rare in Arizona (≤5 cases reported annually) (ADHS unpublished data) several clusters were reported in Maricopa County (MC) during February 2016-January 2017. Public health initiated an outbreak response and developed a knowledge, attitudes, and practices survey for veterinarians. The goals were to determine awareness and general attitudes about canine leptospirosis and to identify gaps in veterinarians' knowledge in treatment and prevention. We distributed a 40-question self-administered online survey to 1058 Arizona Veterinary Medical Association members, made available during February 9-May 15, 2017. We analyzed the results using Pearson's Chi-squared or Fisher's exact test; a P-value <0.05 was considered statistically significant. We analyzed 202 complete responses. Veterinarians from 10 (66%) of 15 Arizona counties were represented. MC practices were more likely to stock leptospirosis vaccine (80%) than other counties combined (58%) (P = 0.004). The average composite knowledge score was 24.4 out of 38 (range 12-37, median 24); 49% of respondents demonstrated higher knowledge as defined by authors, largely in identification of leptospirosis risk factors (86%) and routes of exposure (73%). Fewer than half (45%) of respondents correctly identified the length of time bacteria can be shed in dogs' urine. Eighty-one percent of respondents demonstrated lower knowledge about clinical signs associated with leptospirosis; only 47% of respondents identified eight clinical signs commonly associated with leptospirosis. Sixty-one percent of MC respondents agreed that leptospirosis is an important canine disease in their geographic area, while only 40% of other county respondents agreed (P=0.03). Seventy percent of respondents identified diagnostic testing options. The majority correctly selected infection-control practices in line with recommendations from 2 national clinical guidelines. More respondents would recommend leptospirosis vaccination if dogs traveled or lived in rural areas (87-96%) than if dogs attended day care or were boarded (63%). We identified opportunities for education, including the local epidemiology of leptospirosis, transmission prevention strategies, vaccine safety, testing, clinical identification, and emerging risk factors. Our findings will help guide the design of educational materials for small animal veterinarians in Arizona regarding recommendations for prevention of animal and human leptospirosis infections; these efforts could also shift the culture of reporting companion animal diseases to improve future One Health collaborations., (Published by Elsevier B.V.)