Most mushrooms out there are completely harmless.
With that said, there are a certain subset of mushrooms which can be quite toxic
, causing not only stomach upset, but liver disease, kidney disease, neurological signs, and even organ failure.
While this may be nausea alone, if the signs do not resolve, or you wanted to be proactive, the recommendation would be to go to your veterinarian or the local ER for evaluation, bloodwork, and supportive care. They will likely give fluids, medication for nausea, and charcoal to reduce absorption.
These links may help as well!
http://www2.aspca.org/aspcablog/2006/09/ask-apcc-are-mushrooms-poisonous-to.html I hope this information helps and guides you!
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