National Geographic's October 2007 online magazine has two very informative, at-a-glance graphical presentations of what taboo foods to watch out for with your dog. One is general food taboos, and the other is the effects of various types of chocolate that differs according to the weight of your dog.

Unlike a lot of lists on taboo foods, these lists cover enough background on the "whys" to make it really interesting. For instance, I wasn't aware that the effect of ingesting small amounts of onion can be worse than "wolfing down the whole bulb." And that the yeast in raw bread is particularly dangerous because the expansion of the dough can prevent blood flowing to the heart. Scary. But useful information.