Here is a list with common chemicals and objects that you may have been wondering about:
Swiffer. Long thought to be dangerous (a myth by now), soap-based products in Swiffer and other similar products are no threat; even the blue toilet water is not a problem but keeping the toilet lid down is still the best option.
Chew toys and commercial animal products Though they may be ingested, pet toys for chewing are generally fine--just watch to purchase the appropriate size in order to avoid blockage or excessive wear.
Don't panic if doggie eats a small amt of chocolate--it may result in a bellyache although, smaller dogs may need emergency clinic treatment.
Sugar substitutes such as Xylitol are unsafe and may require a vet visit; this substance is often found in sugar-free gum or candy.
Disinfectants and cleaning products if strength is potent are indeed dangerous, so store in hard-to-reach cabinets and keep from animals during use.
Plants and holiday flowers
Easter lilies, poinsettias, and certain other flowers are poison and can cause kidney failure--lethal to cats and many other animals for sure.
While dogs may consume cats litter droppings, the danger is from blockage and may likely need medical care monitoring.
Fabric, bindings, string and garbage
Never good. Ripped towels, underwear or socks from laundry bins again can bloat in digestive tracts and require surgery to remove; if in large quantities, it may be lethal.
Apple, carrots and bread are not dog food friendly; while not unsafe, pizza dough and the like can cause obesity and, what's worse, begging dog behavior. Dough from pizza and other yeast items can swell inside a dogs stomach.
The little packets that are meant to keep products dry are harmless.
While roach motels have small amounts of insecticide, its most likely not lethal but rodent traps, and the like should be verboten.
If an item is questionable, it's best to take steps to steer or protect pets from its contents. When in doubt, call your veterinarian.