Actually, I have owned a pet, and I recognize the tendency of pets to want to expend energy. There's a long tradition of work by Berlyne with rats as well, which also suggests that all living things have a more or less strong tendency to seek stimulation and that this often obtained through taking on more "work".

However, this tendency is arguably more pronounced in humans, and I didn't want to get into nuances in the article in the interests of brevity, but your point is well taken.

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