Short answer: start changing your dog's routine to match your new schedule at least a week or two before you go back, and keep alone time short at first.
The AKC says to shift your dog's everyday routine slowly toward the new schedule, preferably over at least a week or two. Dogs thrive on routine and learn to expect rituals such as a morning walk, then breakfast, then a nap. It says the hours you spend with your dog when you are not at work should be stimulating.
The AKC notes that a return to work after a long time at home is a common situation that can lead to separation anxiety in adult dogs. If your dog panics when you leave, see separation anxiety signs and plan.
Practice short absences before the first workday. See how long can I leave my dog alone and practice alone.
Talk to your vet about exercise that suits your dog.
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