Sometimes My laci does this with my daughter , BUT when she comes down stairs, its like a bowling ball bounced down, she is louder then the rest of us at 13
, her movements are very quick. She just scoups Laci up off the floor and does this quickly too. I just think because they are so small they are kind of leary of children.. Does your son walk him or throw a ball in the back yard?? Maybe that would help ?? Or maybe keep a bag of treats at the top of the stairs, when your son comes down have him give him a treat??