A new study combining behavioral tasks and cortisol analysis shows that rehomed dogs can overcome initial stress and form strong emotional bonds with their new owners.
In the wake of increased pet adoptions during the pandemic, a parallel rise in dog relinquishments has drawn attention to the effects of rehoming on canine well-being. In a recent study, Sulonen and colleagues investigated the behavioral and physiological outcomes for dogs that had been relinquished or rehomed, compared to those raised in stable homes since puppyhood.
The study assessed 20 shelter dogs, 30 rehomed dogs, and 33 control dogs using behavioral tests—such as the unsolvable problem task and an eye-contact challenge—along with hair cortisol sampling to evaluate long-term stress. Additionally, dog owners completed questionnaires and participated in behavioral synchronization trials.
Results revealed that shelter dogs exhibited shorter eye-contact durations and elevated cortisol levels, indicating greater stress. However, rehomed dogs showed behavioral synchronization with their new owners comparable to control dogs and even surpassed them in reported emotional closeness. This suggests that, although the rehoming process may be stressful initially, rehomed dogs are capable of building deep, lasting bonds with their adopters.
