Sizures In Dogs Foaming In The Mouth. This could be an indication of a epilepsy, stroke or low blood sugar levels. Another possible reason your dog might foam at the mouth is seizures.
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She also can become unsteady. Quite often, right before a seizure hits, a dog may look dazed, or she may look as if she is staring off into space. After the seizure lifts, she usually will appear wobbly and disoriented.