Fourteen-year-old Carlos from Brazil found a paralyzed stray dog dragging itself through the dirt. He couldn’t walk, couldn’t run — and had been abandoned.

Carlos didn’t have money, but he had tools and heart.

Using bicycle wheels, wood, and straps, he built a custom wheelchair for the dog. It took two days — and when he placed the pup in it, the dog took off like a rocket.

Now, the story is spreading like wildfire, and Carlos is getting offers from engineers and universities. But all he says is: “I just wanted to help.”