There is a FB group I highly recommend that specifically deals with identifying potential toxic ingestion.
Poison Help; Emergency Identification For Mushrooms and Plants:
https://www.facebook.com/groups/144798092849300
They do not allow outsiders to comment, only approved persons from a multitude of regions around the world. They do not deal with queries as to identification UNLESS there is a human or animal that has actually ingested the item and is displaying concerning symptoms. Strictly for emergencies, not preventative identification.
This is the "go to" site for vets and ER docs.
As to dealing with an intoxication, depending on the substance, vomiting CAN be the worst possible thing you can do; but if advised to induce vomiting, drinking 10-200mls (depends on victims size) of strongly salted water will induce vomiting in both pets and humans.
Use of activated charcoal will "bind" the toxins, hopefully allowing them to pass safely. This is not charcoal in the normal sense, and I do not know how it is "activated" but do purchase the proper stuff; it comes in a thick paste (great to mix with dog food for a pet) or powder (loose or capsules) for human ingestion.