Yes, most dogs eat grass to induce vomiting. Odd how they know to do it. I have known one dog that ate grass just because, but my 3 seem to do it when they aren't acting like they feel well, and then they vomit shortly after.
As for the nose thing, I believe that a cold nose is generally a sign of good health - now, a warm nose doesn't necessarily signal a specific problem, but it can be a symptom, which is why vets often ask or check for that.
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