Ok, u are not alone. My Dolce did the same thing....she constantly is like a little Evil Kneivel and jumps off of anything and tries to climb onto anything....she jumped outta my boyfriends arms when she was about 3 months old and landed on her foot...she didnt cry or anything and then was limping around but not acting like it hurt, just like she was scared or she shocked herseld. I took her to the vet anyway and they were surprised she didnt cry. They gave me some antibiotic in case it was sprained and she limped for a day or 2 and then was fine. She has banged her head a million times on the corners of the walls when she in mid sprint and from the sound i thought she cracked her head open. Alas, she was fine and i was the one who almost had the heart attack. Like the vet said, just make sure he isnt showing any signs of a concussion or anything worse. Im sure he will be fine as he sounds like he is a tough little one like mine. We're all here for u if u need to ask anything!!!
Puppy kisses from Dolce to ur little one!!