I do not have a roommate anymore. I can't give anyone a key to my house because I have a mean English bulldog.
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I have left my cat alone for a week, but I would not to that to a dog. Cats are territorial and in the wild live alone for long stretches of time. Dogs are never loners and do much better with daily activity and interaction.
Dogs are not like cats. You can introduce someone to the dog before you leave and they will accept them as part of the 'pack', while cats simply don't warm up to strangers.