[header] How to build a dog ramp [title] Calculate how long your dog ramp needs to be. [step] If you need the dog ramp to cover a set of steps, measure the distance from the bottom of the steps to the top and add 4 inches (10.16 cm). [title] Place two 2-inch by 2-inch (5.08 cm by 5.08 cm) pieces of lumber on a firm surface. 
[step] Measure the desired length of the ramp. Mark the length on both boards with a pencil.