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This may be a reason to have two and it is also true that energy levels DO vary. My first pair rarely even went for walks (unappealing neighborhood with the occasional nasty stray); with Jasper and Chelsea we do go for a 30-45 minute walk on weekends. I also play fetch with Jasper for a while whenever I go out back. But basically they have all self-exercised in the fenced yard. When they get antsy they chase each other round and round like maniacs. Chelsea "hunts" much of the day and that engages her mind as well. Would they love to go running off leash through the woods (if we had any)? Sure. Are they neurotic or destructive? No. Neither were my even more "deprived" first pair, which included the Sainted Pepper, the Best Dog Who Ever Lived.