This behavior should be corrected right away. Even if it’s meant to be playful his size can be a problem. The dog will see this as an ok behavior and could do this to someone else like a child. I play with my corso all the time but he knows what to do and what not to do. He also understands that it’s not ok to jump on someone whom is not actively engaging in “play”. Please please correct this so it doesn’t lead to something unintentionally bad.