As a mixed-breed terrier, I prefer human food to dog food. Unfortunately, when I turned ten, I had to go on a special low-ash diet. My snacking is limited to steamed carrots. Since I started the diet, my ears grew three inches and I started to hop
William D. Cusick, The Animal Advocate, has material on how to keep us terriers healthy. He also has nutrition information for other breeds.
Terriers have rather poor vocabularies, humans are much better. FreeRice.com hosts a vocabulary game. For each word you get right, they donate 10 grains of rice to the United Nations World Food Program, sending snacks where they are most needed.