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Accurate measurement of owner\u2010reported QoL and treatment satisfaction (TS) supports disease burden and treatment benefit evaluation.<\/jats:p><\/jats:sec><jats:sec><jats:title>Objectives<\/jats:title><jats:p>Develop and evaluate an owner\u2010completed canine dermatitis QoL and TS questionnaire (CDQoL\u2010TSQ) in allergic dogs.<\/jats:p><\/jats:sec><jats:sec><jats:title>Materials and Methods<\/jats:title><jats:p>The CDQoL\u2010TSQ was drafted following review of existing measures and expert input. Content validity was assessed through interviews with owners of allergic dogs. Psychometric properties of the QoL domains (Canine QoL, Owner QoL) were evaluated. Score interpretation was derived.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Twenty dog owners were interviewed. Item wording was amended following the first 10 interviews. Data from 211 owners were used in the psychometric evaluation. The Canine QoL domain demonstrated strong internal consistency (<jats:italic>\u03b1<\/jats:italic>\u2009=\u20090.89), test\u2013retest reliability (ICC<jats:sub>2,1<\/jats:sub>\u2009=\u20090.844), moderate convergent validity (<jats:italic>r<\/jats:italic>\u2009=\u20090.41) and moderate\u2010high known\u2010groups validity (effect size 0.37\u20130.64). The Owner QoL domain demonstrated strong internal consistency (<jats:italic>\u03b1<\/jats:italic>\u2009=\u20090.73), high convergent validity (<jats:italic>r<\/jats:italic>\u2009=\u20090.63) and moderate\u2010high known\u2010groups validity (0.43\u20130.63). Test\u2013retest reliability approached moderate strength (ICC<jats:sub>2,1<\/jats:sub>\u2009=\u20090.490). Group\u2010level interpretation analysis showed minimal important difference of 7.0\u201313.6 points for dogs and 13.0\u201313.6 for owners. For individual dogs a change of 6.3 or 12.5 points for dogs, and 12.5 or 18.8 for owners indicates a response.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions and Clinical Relevance<\/jats:title><jats:p>The CDQOL\u2010TSQ is a two\u2010part assessment to evaluate QoL and TS in canine allergic dermatitis. The QoL questionnaire demonstrated validity and reliability, and interpretation of scores was derived, making it suitable for use in research and practice. The TS module is suitable for clinical setting use to improve owner\u2013veterinarian communication.<\/jats:p><\/jats:sec>","DOI":"10.1111\/vde.13242","type":"journal-article","created":{"date-parts":[[2024,2,16]],"date-time":"2024-02-16T04:15:17Z","timestamp":1708056917000},"page":"386-399","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Development and validation of a questionnaire to assess owner and canine quality\u2010of\u2010life and treatment satisfaction in canine allergic dermatitis"],"prefix":"10.1111","volume":"35","author":[{"given":"J. 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