The telephone call I hope you never have to make is to a pet poison control center. If the situation does arise, however, I hope you will have the appropriate contact information close at hand.
Two poison control organizations that I strongly recommend, and which are available to you 24/7 are the Animal Poison Control Center (1-888-426-4435) and the Pet Poison Helpline (1-800-213-6680).
If uncertain if your pet has ingested or been exposed to something that is toxic, call one of these organizations right away. You will either be fully reassured or instructed on what course of action to take.