It is important to recognize that many of the foods that are good for humans to eat may be harmful even deadly for an animal to ingest. We must remember that animals, including Westie puppies, have different metabolisms than we do which makes it hard for them to properly digest a wide variety of foods.

Below is a list of the common food items that can pose a risk to the health of your West Highland White Terrier, and should, under no circumstances, be given to a dog to ingest:
Alcoholic Beverages
Bones from Fish, Poultry, or Meats
Cat Food
Chocolate, Coffee, Tea or Caffeinated products
Citrus Oil and Extracts
Fat Trimmings
Grapes and Raisins
Hops
Human Vitamins and supplements with Iron
Large amounts of Liver
Macadamia Nuts
Milk and other Dairy products
Moldy or Spoiled foods
Mushrooms
Onions and Garlic (powders, raw or cooked)
Persimmons
Pits from Peaches or Plums
Potato, Rhubarb, and Tomato Leaves, Potato and Tomato Stems
Raw Eggs
Raw Fish
Salt
String
Sugary Foods
Table Scraps
Tobacco
Yeast Dough

Original Sources: westiepuppiesforsale.net