A dog would be a great addition and the perfect solution to your situation. If it's a good watchdog (loud barking alert dog) it would quickly get used to your schedule and anticipate your return, but alert if anything unusual happens, such as anyone but you returning home. You have a HUGE variety of breeds that make a good "Watch" dog so don't think you need a "Guard" dog.
I love an Australian Shephard for a watch dog, they are very suspicious of changes in environment and almost invariably will bark vigorously at a stranger near their "castle".
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