Background [edit]. In 1985, the DoD called for an extensive review of the education and training functions. At the same time, President Reagan established the Packard Commission to review the management of the DoD.
Itâs recommended that four hours is the longest that dogs should routinely be left alone for. Every dog will be different, dependant on how old they are and what they are used to. For example, four hours would generally be too long for a very active, young puppy.
Adolescent dogs between the ages of 5 â 18 months can be left alone for up to 4 hours at a time but this must be worked up to gradually. Adult dogs (those over 18 months of age) can be left alone for up to four hours at a time.