Dangerous Household Items:

•    Never let a dog chew on a sock, towel or underwear.  These things smell like you so they are especially appealing. They can obstruct a dog's digestive track and kill him.

•    Never give a dog a bone that has been cooked.

•    fabric softener sheets

•    mothballs

•    post-1982 pennies (due to high concentration of zinc)

•    dental floss, rope, yarn, string (this can get wrapped around the intestines)

•    tinfoil (will line the walls of the intestines and prevents absorption of nutrients)

Foods to keep away from your dog:

•    alcoholic beverages

•    avocado

•    chocolate (all forms)

•    coffee (all forms)

•    fatty foods

•    macadamia nuts

•    moldy or spoiled foods

•    onions, onion powder

•    raisins and grapes

•    salt

•    yeast dough

•    garlic

•    products sweetened with xylitol or aspertame (chewing gum, sugar free candy, pudding, etc)

Warm weather hazards:

•    animal toxins: toads, insects, spiders, snakes and scorpions

•    blue-green algae in ponds

•    citronella candles

•    cocoa mulch

•    compost piles

•    fertilizers (this can be dangerous when ingested or can burn bare paws)

•    flea products

•    outdoor plants and plant bulbs

•    swimming pool treatment supplies

•    fly baits containing methomyl

•    slug and snail baits containing metaldehyde

Cold weather hazards:

•    antifreeze

•    liquid potpourri

•    ice melting products

•    rat and mouse bait

Human medications that can be lethal, even in small doses, to pets:

•    pain killers (Motrin)

•    cold medicines

•    anti-cancer drugs

•    antidepressants

•    vitamins

•    diet pills

Holiday hazards:

•    Christmas tree water (may contain fertilizers and bacteria)

•    electrical cords

•    ribbons or tinsel (can become lodged in the intestines)

•    batteries

•    glass ornaments

Plants that are toxic to dogs:

For a complete list please refer to http://www.uexplore.com/health/poisonplants.htm.
I have listed some of the most common toxic plants below:

•    Aloe Vera

•    Amaryllis

•    Apple (seeds)

•    Apricot (pit)

•    Azalea

•    Baby's Breath

•    Cherry (seeds & wilting leaves)

•    Clematis

•    Crocus

•    Daffodil
•    Dieffenbachia (many varieties)
•    Dracaena (many varieties)
•    Easter Lily
•    Eucalyptus
•    Fern (many varieties)

•    Foxglove
•    Geranium
•    Ivy (many varieties)
•    Lily (many varieties)
•    Marijuana
•    Mistletoe
•    Morning Glory
•    Onion
•    Peach (wilting leaves & pits)
•    Poinsetta (low toxicity)
•    Poison Ivy or Oak
•    Primrose
•    Rhododendron
•    Philodendron (many varieties)
•    Tomato Plant (green fruit, stem & leaves)