Why Labs do this
The Labrador Retriever began in Newfoundland, where fishermen used water dogs to haul nets and retrieve fish from icy water. English breeders later developed them as retrievers for shot birds. Retrievers were meant to work closely with people, to be eager, and to carry things in their mouths.
Many Labs bring that eagerness to everything. They want to reach people, greet them, and be near. They also tend to be strong, athletic, and food motivated, and they often stay puppyish for years. Individual dogs vary, but pulling and jumping are very common complaints.
Both behaviors are rewarded all the time. If pulling gets your dog to the smell or the person faster, they learn to pull. If jumping gets attention, even a push or a "no," they learn to jump. Dogs repeat what works. Our Labrador Retriever guide has more on the breed's background.
If you have a puppy or adolescent Lab, expect this to take months. Retrievers are slow to mature, and the behavior returns at times when excitement is high, such as new places or visitors. Staying consistent through those moments is what makes it stick.