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How to calm down a playful large dog
Take your dog on a long walk.
One way that you can work out some of your dog's energy is to take him on a nice long walk. Keep in mind that a stroll around the block will probably not be enough to calm your dog down.
You will have to walk with him for about an hour or even go running with him if you are able. If you cannot walk your dog due to physical limitations, setting up a long line in your backyard that your dog can run back and forth on may help.