Dairy is ok in small doses but some dogs have an issue with it. Yogurt is the easiest to digest (doggie ice cream is usually frozen yogurt). Mine get a teaspoon of non-fat plain yogurt with their meals for the pro-biotic qualities.
Here's a fairly comprehensive list of foods that are toxic for dogs.
The main ones that require induced vomiting are:
chocolate
macadamia nuts
Xylitol foods
Onions/garlic/onion family foods
wild mushrooms
avocado in large amounts
Peach pits
HOW TO INDUCE VOMITING:
Give one tablespoon of hydrogen peroxide (use a syringe or dropper) and wait 10 minutes. if the dog doesn't barf, give another tablespoon. It should be effective within a very short time.