Thanks Maggie - I've done a little googling too - I don't know if this is a help for others...but will cut and paste here (Mods: Please delete if you feel this shouldn't be here.)
From:
http://www.dog-pictures.co.uk/dog-care-articles/common_plants_poisonous_to_dogs.shtmlDumb cane is probably the one plant that should always be kept out of reach, since it takes only one nibble to have a potentially fatal situation. (from Carlson & Giffin.)
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That give rash after contact with the skin or mouth: (mums might produce dermatitis) chrysanthemum poinsettia creeping fig weeping fig spider mum pot mum
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Irritating (toxic oxalates), especially the mouth gets swollen; tongue pain; sore lips; some swell so quickly a tracheotomy is needed before asphyxiation: arrowhead vine majesty boston ivy neththytis ivy colodium pathos emerald duke red princess heart leaf (philodendron) split leaf (philodendron) saddle leaf (philodendron) marble queen
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Toxic plants - may contain wide variety of poisons. Most cause vomiting, abdominal pain, cramps. Some cause tremors, heart and respiratory and/or kidney problems, which are difficult for owner to interpret: amaryllis elephant ears pot mum asparagus fern glocal ivy ripple ivy azalea heart ivy spider mum bird of paradise ivy sprangeri fern creeping charlie jerusalem cherry umbrella plant crown of thorns needlepoint ivy
Here are more miscellaneous plants that we found on other lists. The reactions to these plants are unknown, but they are considered dangerous and should be avoided.
Monkshod Andromeda English Ivy Apple seeds (cyanide) Elderberry Narcissus (bulb) Arrowgrass Avocado Oleander Hyacinth (bulb) Boxwood Hydrangea Poison Ivy Iris (bulb) Cladium Japanese Yew Rhododendron Jasmine (berries) Rhubarb Cherry Pits (cyanide) Snow on the Mountain Chokecherry Stinging Nettle Climbing Lilly Laburnum Toadstool Tobacco Laurel Tulip (bulb) Daphne Walnut Marigold Wisteria Dieffenbachia Yes Mistletoe
Common Outdoor Plants Poisonous to Dogs
(from Carlson & Giffin.)
•Produce vomiting and diarrhea in some cases: delphinium poke weed indian tobacco daffodil bittersweet woody wisteria castor bean ground cherry soap berry indian turnip fox glove skunk cabbage larkspur
•May produce vomiting, abdominal pain, and in some cases diarrhea horse chestnut buckeye western yew apricot, almond rain tree monkey pod english holly peach, cherry privet wild cherry mock orange japanese plum american yew bird of paradise balsam pear english yew black locust
•Varied toxic effect rhubarb buttercup moonseed spinach nightshade may apple sunburned potatoes poison hemlock dutchman's breeches tomato vine jimson weed mescal bean loco weed pig weed angel's trumpet lupine water hemlock jasmine dologeton mushrooms matrimony vine dumb cane
•Hallucinogens marijuana periwinkle morning glory peyote nutmeg loco weed
•Convulsions china berry nux vomica coriaria water hemlock moon weed