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Dogs go through stages in their life, just as people do, as is obvious to anyone who has watched their stiff-legged, white-muzzled companion rouse themselves to go for one more walk. Poets from Homer to Pablo Neruda have taken notice. As have folk singers and storytellers. Now science is taking a turn. https://www.nytimes.com/2020/11/09/science/dogs-aging-behavior.html