With proper access to water and shade, certain dogs are able to stay outdoors for up to 12 hours at a time.
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Or sometimes people think that dogs are happiest outside, with fresh air and room to run all the time. But dogs left alone outdoors usually don't enjoy themselves much–they're waiting for company.
If possible, dogs older than 6 months should not be left alone for longer than 4 hours at a time. If this is difficult, the absolute maximum time for them to be alone is 8 hours, but this is only recommended if your dog has a way to get outside for a bathroom break.