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But irrespective of size, why do our beloved pets have lifespans so much shorter than our own? Well, dogs are in possession of faster metabolisms and hearts that work harder than our own. Because of all this extra work, dogs age faster and, consequently, live shorter lives. It also means they grow up more quickly.
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The reason that dogs can reach full sexual maturity after only a year is that our canine friends age faster during the first two years of their lives than humans do.

Compared to humans, dogs age more quickly at the beginning of their lives and slower toward the end.

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