“…These comorbidities in dogs include increased fear/anxiety, defensive aggression, abnormal perception, inattention, excitability/impulsivity, and show remarkable similarities to its human counterpart resembling anxiety and attention-deficit hyperactivity disorder (Shihab and others 2011, Jokinen and others 2015, Packer and others 2016). The carer commonly assesses non-metric aspects like neurobehavioral changes and QoL aspects based on their perception (Lord and Podell 1999, Chang and others 2006, Shihab and others 2011, Muñana and others 2012, Packer and others 2016). The carer's perception of their dog's QoL may be biased, but with this in mind the carer can serve as surrogate.…”