I'd definitely keep it out of reach. Ferrets need a very high protein diet supplemented with certain amino acids. Dog Food contains many more carbohydrates and fiber -- things that are not very good for a ferret. Ferrets require about the same diet that a kitten would -- very high protein, low fiber...and the first three ingredients on the food list should be animal products. They are strict carnivores. Many people even feed their ferrets totally raw meat and nothing more -- this would be ideal but unfortunately my own ferrets are now too old to switch over ;[. I currently feed a blend of Totally Ferret and ZuPreem =D.