Indiana is one of the states that has a restraint statute, which means that dogs must be restrained at all times. Otherwise, if the dog bites a person when not restrained the owner is subject to civil liability and criminal penalties. (Cite needed; definition of "restraint" needed; discussion of local Indiana ordinances forbidding dog tethering needed.)
This type of training is more effective because it builds a bond of trust and cooperation between animals and humans, the animals (and the humans) actually look forward to training! No one looks forward to punishment, or even the probability of punishment!  We all want to be told when we do something right, not belittled, hit or corrected when we do something wrong!
Leash walking outside may be more frustrating because there are numerous distractions for you to compete with for your puppy’s attention. Understand, from his point of view, how much more difficult this task has now become, and whatever you do, don’t lose your patience; don’t drag him or allow him to drag you! Walk slowly and click and treat if he stays at your side. If he begins to pull, stop or change your direction, then click and treat when he reaches your side again!
Cat leashes are used with the purpose of preventing the cat getting lost. Unlike dogs, cats rarely attack persons on the street, so cat leashes are mainly a safety measure to protect the pet itself. Very often the collars are replaced with harnesses, because they avoid the dangers of collars which include escaping and running away or choking. Cats are more likely to not be willing to be walked in a harness than dogs are, and are considered to need up to months to be able to adjust to wearing a harness.
Consider why puppies pull when they are walking; there are many things that tempt your dog when you’re out for a walk, like children playing in the yard across the street, you neighbor grilling some hot dogs and that squirrel in the tree at the park. Your pup will try to get where he wants to go, even if that means pulling you along with him! If he pulls on the leash and you allow him to, you’ve reinforced that pulling gets him what he wants. Once you’ve allowed him to do this, he’ll do it again and again:

In Connecticut, dogs are not permitted to run at large except in the situation of hunting. Still, if the dog has vicious propensities and the owner still allows it to run at large and a person is bitten, the owner can be fined for up to $1,000 and is also liable for 6 months of prison unless the victim has abused the dog and provoked the harmful behavior.
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