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In a cross\u2010sectional prospective study, 118 healthy client\u2010owned adult dogs from 10 breeds\/breed types completed a spatial judgement bias task and other cognitive tasks including sustained gaze and a cylinder task. Dogs also underwent emotional reactivity testing and owner assessment using the Canine Behavioral Assessment and Research Questionnaire (C\u2010BARQ). Breed effects and cross\u2010domain associations were evaluated using nonparametric and covariate\u2010adjusted regression models. Judgement bias and delta scores showed no consistent breed differences. Although breed was significant in an initial covariate\u2010adjusted ordinal model of judgement bias, it was not retained after AIC\u2010based model reduction. Judgement bias was not associated with novel object responses, disgruntled stranger scores, or most C\u2010BARQ traits. Higher familiar\u2010dog aggression scores were associated with lower odds of pessimistic bias outcomes, and disgruntled stranger performance correlated positively with C\u2010BARQ stranger\u2010directed fear. In contrast, sustained gaze duration differed markedly by breed and remained breed\u2010dependent after adjustment, with retriever breeds showing longer gaze durations than Maltese and several other breeds. Cylinder task outcomes showed subtler breed\u2010related effects, but familiarisation trial number and owner\u2010reported excitability were more consistent predictors than breed. These findings suggest that, in healthy pet dogs, affect\u2010related judgement under ambiguity is shaped more by individual\u2010level factors than by breed, whereas sustained gaze scores and some cylinder task scores show some breed\u2010related patterning. Very few breed differences were found overall, and the results of this study reinforce the value of multimodal approaches to canine affect and cognition, and the use of caution regarding breed stereotypes.<\/jats:p>","DOI":"10.1111\/avj.70127","type":"journal-article","created":{"date-parts":[[2026,8,4]],"date-time":"2026-08-04T23:30:38Z","timestamp":1785886238000},"page":"689-700","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Investigation of breed\u2010related variation in judgement bias, sustained gaze and cylinder task performance in healthy pet dogs"],"prefix":"10.1111","volume":"104","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-3311-0448","authenticated-orcid":false,"given":"RSC","family":"Seymour","sequence":"first","affiliation":[{"name":"The Vet Behaviour Clinic  Gold Coast Queensland 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