http://www.gsdsecrets.com/what-not-to-feed.htm
I agree with Most stuff on this list. I just wish they specified that its COOKED bones which are dangerous to dogs and cats. These bones can splinter and break and cause obstructions. Raw bones, however, as excellent for dogs and cats.
Also just to clarify, tuna can be given as a treat, it just can't be given as a main part of their diet. The tuna fish we eat is processed foods and it doesn't have all the nutrients in it that say a fresh tuna would have. I wish my cat some tuna every time i eat it because he likes it. No harm done.