depends ours are left from anything from 5 mins at a time to 8-9 hours. with so many people in the house its vary rare that no one is in for such a long period of time but it does happen. My dogs also do not have a regular pattern as many others do, it has done them no harm and i personally feel its better for them so as when some strange occurace does arise they are not fazed by it, then again i know many people disagree and feel a dog needs a daily routine. i think it depends on both you and your dogs.

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