Most dogs like jumping on people because that is what they do when they interact and play with other dogs. My Siberian Husky likes to jump because she likes to lick at people’s faces and for her special friends, nibble at their chin.
However, many people consider jumping to be rude dog behavior. Jumping can also be dangerous if the dog is large, because he can easily knock down and hurt a child or a senior adult.
Interestingly though, dog jumping behavior has much more to do with us than with our dogs.