I have two big dogs, a Lab and a Golden retriever. The golden got some cuts on him. I began to look under the RV because the dogs lay under it when not inside. I found about 12 nails sticking down about 3 inches that came through the basement area of the fifth wheel. The angle iron that holds the holding tanks with sharp edges. Long bolts with no plastic caps. The step's have sharp edges. I have spent a lot of time cutting nails and putting rubber on sharp metal. If you have dogs, check under your RV to save your Pets.