Ragen T. S. McGowan and colleagues studied dogs’ responses when their actions unlocked a reward. The paper appeared online in 2013 and in the 2014 volume of Animal Cognition; it was not a new 2024 service-dog trial.
Twelve beagles took part in a matched design. In one condition a learned action provided access to a reward; in the control condition access followed a matched delay regardless of the dog’s action. The researchers reported differences in excitement and frustration.
The study suggests that manageable learning opportunities can be rewarding. It does not establish that a particular technique improves service-dog reliability or that tail wagging always means happiness. Observe the whole dog, offer achievable challenges and adjust when your partner shows discomfort or frustration.