Hypothesis
If the watching-eye effect in humans reflects a general tendency to avoid risk when observed, dogs — which act cautiously when watched — should also steal food more slowly in front of pictures of eyes.
What failed
Dogs took no longer to steal forbidden food when a picture of eyes was displayed than when a picture of flowers was.
Broken assumption
The watching-eye effect is a general animal response to being observed rather than something specific to humans.
Why
The authors take the null as evidence against the general risk-aversion explanation, leaving a human-specific reputation-management account as the alternative.
From the published paper: Neilands et al. Scientific Reports, 2020. ↗CC BY