There are risks with walking a puppy that young, especially since they are not fully vaccinated until 16 weeks (if memory serves me right). So you REALLY have to be careful where you take him. Like, NO PUBLIC PLACES, like pet stores, local parks, etc. until then. Parvo is a terrible disease, and is EVERYWHERE. Just be careful until he's done with his vaccinations. Also, keep in mind that a dog can carry Parvovirus and NOT suffer from it. Just be careful.There's no real reason you can't walk a 9 week old pup, just might have to carry him around when he gets tired or sick of it unless the problem is that he can't keep up. I started walking Ellie before Buddha just so the little guy could get a rest from her, he was the unhealthy runt and she was a million miles an hour... now they both are 2 million miles an hour. Being whippet mix they love running around as fast as possible just as much as lazing around doing nothing.