Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to help a dog overcome its fear of stairs [title] Change the texture of the stairs. [step] Your dog may be afraid of the surface material of the stairs in your home. If this is the case, you can try to change it up so your dog can feel more comfortable.

Ending1: Sometimes, a new texture can just be used, but if a change will deter your dog from going up the stairs, then it's best to change that down from what the dog is used to. Look for different textures in the existing stairs. Ending2: If you have uncarpeted stairs, consider adding carpet squares or another kind of surface gripping product to the stairs. [substeps] Dogs can easily slip on stairs made out of wood, marble, or tile. Ending3: Altering your staircase's texture will help deter fear, and make the stairs less frightening. [substeps] You can mix a little sanding powder or furniture wax into your ramp's surface. Ending4: This could be by introducing a lighter textured color or texturizing the treads so that the floorboards can penetrate deeper into the depth of the stairs. [substeps] You might try replacing down stairs with wood stairs.

Answer format: ending1/ending2/ending3/ending4