Taking each species separately, dogs showed a decrease in the frequency of stress signals from 6 to 8 weeks of age, whereas wolves showed a trend in the opposite direction, with more stress signals being exhibited at 8 weeks than 6 weeks of age (Figure 5 ).
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Motivational Factors Underlying Problem Solving: Comparing Wolf and Dog Puppies' Explorative and Neophobic Behaviors at 5, 6, and 8 Weeks of Age.
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