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I have a well trained black lab, comes everywhere with me, has been on a 4 month road trip, has sailed from maine to the Gulf of Mexico, he's been on multiple 4 day backpakcing trips. But dogs aren't built for the same distance man is, biomechanically speaking humans are far more efficient movers, and over the course of time a dog will take more ware and tear. Unless you hiking for months though, I'd never leave the dog.