You are the only one that can answer this question.  But here is what we can provide.

Our ramp will sit about 6 inches above the water.

A standard couch sits 20 inches off the floor.

If your dog can jump up on a couch, then your dog can jump onto your boat if your boat platform sits 26-28 inches from the water line.

 Note: be sure the ramp is fully dry before storing. First, Open the valve and push it down and Twist, this will lock it into the open position. All the air will rush out. You can let it deflate on it's own or stand on it to push air out.  Next take the Legs/mesh of the ramp and fold it up onto the platform section.  Then fold both left and right sides inward and overlap them.  The plastic pipe in the end of the mesh can be bent to allow for folding. Use the strap that you took off when you set up the ramp to strap the ramp together.  Now put the ramp and all accessories into the storage bag.