Check to see if your dog is unusually stressed or excited. A cause of this could be a change in environment, new stimulus, or an environmental change, like a thunderstorm. Some vets argue that these stressors will bring on the hiccups in canines. Some claim that overly energetic playing and heavy breathing could also bring about a bout of hiccups. The best way to manage these is to relax your dog by getting him to sit or lie down, have some water, and regain his normal breathing pattern.
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