The bigger question is: Does the dog use the door and ramp?
If the dog uses it, the purpose is achieved. You do know that when the dog gets a little older you might need to add rails to meet OSHA requirements, you don't the dog to sue you if he/she falls off the ramp! Remember .... safety first!
Phobia is right about one thing. Buy good tools to do the job. Over the years I've been adding to my tool assortment. I plan on doing as much of the finish work on our new home as I can and you gotta have the right tools.