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I would check out gums, esp the folds around the mouth. That in some dogs is a cause of really bad breath, so bad you can smell them when they're in another room ! Dead skin, saliva, and bits of food get trapped there and the moist environment is a breeding ground for bacteria. It is called something but I can't remember what, and some dogs are born with excess folds which creates the problem.
I too would be inclined to take him to the vets if it's bad and more than 'doggy breath'.
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