The ASPCA's Animal Poison Control lists these products as the most common ones that can poison pets. These are not the only ones, just the most common ones.
Fabric softener sheets
Toilet cleaning tablets
Vinegar and water
Medications and Cosmetics
Aspirin, baby aspirin
Bar soap and face wash
Breath fresheners (Xylitol)
Cigarettes and nicotine patches
Ibuprofen and naproxen
Kaopectate and Pepto Bismol
Mosquito repellent with DEET
Pseudoephedrine (and other nasal decongestants)
Topical creams/ointments (read labels for ingredients)
Visit the ASPCA Poison Control Center for more information regarding the listed items.