I guess I have to rant here a little bit... about the internet as a source of information. It can be very good and it can be very bad... As mentioned earlier warfarin type poisons are anticoagulants. After being eaten, your liver is blocked from making factors necessary for blood coagulation, factors II, VII, IX, and X and the anticoagulant proteins C and S. Blood loss results in "hypovolemia", lack of blood volume, which to some people would equal dehydration. Not exactly the same but to a "nonmedical" person, the difference may be negligible. But with the warfarin compounds, what you die from is the blood leaking out of your capillaries into lungs, abdomen, thoracic cavity and brain/spinal cord.
Hope this helps..