If you had to guess, what would you say three of the most common pet poisons are?

Dr. Barchas talks about just that on his blog today. He also goes over what to do if (dog forbid) one of your pets should end up ingesting something poisonous: Go to the vet immediately, bring the wrapper for the poisonous stuff (if you know what it is), and if there's any of it left, bring that too. Getting there fast and knowing what's causing the problem can help get your pet healthy again quick.

So, any idea what they are? I guessed two of them correctly, but the third one is kind of a shocker!