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When My Dog Yawns, What Does It Mean? - PetsFoodNutrition.com Simply said, when dogs are stressed, they yawn. Yawning is one of the numerous signals dogs use to relax when they are nervous or restless, according to Turid Rugaas, a Norwegian behaviorist and author of On Talking Terms With Dogs: Calming Signals. When a dog enters a veterinarian facility, it may be stressed.