Have you bought this for your son on his birthday. I already bought a pair of these walking pet balloons for my son. One of them is like a shape of tortoise and the other was a dog. He was very fond of these and used to play with them all the time. I simply fills it with air or hydrogen and after filling I made it closed. It was more durable and made with high class design and advanced equipment looks very interested if decorated in Parties. I think these are the toys which best attracts kids.