Details of dogs in the study that completed cognitive bias testing.

Table shows source of dog, breed, sex, sessions to learning the discrimination task, percentage of each tone responded to in the two training sessions used to calculate a significant difference in latency prior to testing, and variance score computed from latency and standard deviation data related to unreinforced probe tones. High variance score indicates optimism. Variance score could not be calculated for some dogs as their data lacked a tipping point, a necessary attribute for this calculation. On occasions (n = 4), no tipping point could be determined due to overall high latencies such that average latency could not increase by 100% and still be within the 10-second response window. These dogs were categorised pessimistic. Two dogs displayed high response rates across all cues so that average latency did not increase by 100% between two adjacent cues.Details of dogs in the study that completed cognitive bias testing.