A. A dog should only be left in a kennel for no more than 6 hours. It is very hard on a dog to sit in a cage and do nothing all day. I would highly suggest taking him to a dog day care. Mastiffs require a lot of attention and exercise so I think dog day care would be a perfect fit for him if you're busy all day. I would recommend visiting your regular veterinarian and seeing if there is some sort of injury.
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