Depending on their prey, carnivores such as dogs (and especially cats) have evolved to filter their food from toxic materials. Furthermore, they are exposed to synthetic preservatives such as BHT and BHA in their foods, prescription drugs, environmental air and ground toxicity (thanks to insect sprays), as well as chlorine and other chemicals contained in tap water. The liver's ability to neutralize all these toxic materials is exceeded. The Fresh Food Tower provides an excellent solution for clean, fresh dry food.