Müller, C. A., Riemer, S., Rosam, C. M. et al. 2012. Brief owner absence does not induce negative judgement bias in pet dogs. Animal Cognition 15(5), 1031–1035.
Humans in a negative emotional state are more likely to judge ambiguous stimuli as negative. In recent years, similar judgement biases have been found in some non-human animals that were exposed to long-term or short-term...