There are plenty of things a new puppy will learn during their training. You need to teach them to do their business outside, you have to get them used to following commands, you’ll need to let them know that they can’t chew up your furniture, and if you want to use a crate, then you need to get your pup used to it.
While most dog owners know that taking their dog out for regular walks is a necessity, they often don’t anticipate how tricky it can be to get their puppy used to a leash. Some dogs naturally take to being led around at the end of a loose tether, while others are confused by the restraint and will react in ways that are difficult to control.
If you have a leash-reactive dog, it can potentially dangerous to your puppy, yourself, or anyone (animal or human) that you come across while out in the world. To make sure that your dog does their best on each walk, here are a few tips on how to deal with a puppy that has leash reactivity.
Source : https://www.littlethings.com/puppy-leash-reactivity/