Purposes of a leash include: preventing animals from frightening or biting people or other animals, defecating and urinating in inappropriate places, endangering traffic, digging up lawns, causing other damage, getting lost, and getting away from owners. Leashes also provide a clear method of communication and ensure control during training of dogs.
High quality dog leashes have a good quality metal clip and they can be made of leather, nylon or even chain. The metal clip must securely fasten to a metal ring on the collar in order to maintain good control of the dog.[10] The material of which the leash is made of is not of great importance as long as the leash does not show evidence of wear or fraying. Therefore, leashes should be periodically checked to ensure they are maintained in proper condition.
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.
States that do not have statewide leash laws are Alabama, Alaska, Arizona, Arkansas, California, Colorado, Florida, Georgia, Hawaii, Idaho, Iowa, Kansas, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Montana, Nevada, New Jersey, New Mexico, North Dakota, Oklahoma, Oregon, Rhode Island, South Carolina, South Dakota, Texas, Utah, Vermont, Virginia, Washington, and Wyoming.

This inexpensive leash is billed as "indestructible," and this pick was a favorite of our consumer (and K9!) testers. Users raved about the reflective material and thickness of the leash, confident that it could hold up to even large dogs' pulling. Testers also loved the look and security of the clip, although it may be a little large for small dogs. 
If you’re looking for a leash that’s easy on the wallet, safe and durable, the Blueberry classic leash is a great choice. We love that it comes in 12 different colors and five sizes (ranging from four to five feet in various widths) so that it can work with nearly any dog. If your dog is easy on the leash and doesn’t require a lot of control or guidance, a standard nylon leash will do the job. We recommend this leash for dogs 75 lbs and under, as larger pups may need a stronger version.
Dog leashes are used to walk the dog in public places. Having the dog wear a leash is a way of protecting the dog and other persons (e.g., if the dog runs away and bites someone). Also, the length is one of the important aspects of the leash. The length of the leash must be chosen according to the size of the dog and it is important because it allows a good control. Leashes should not be either too long or too short. Too long leashes do not provide good control of the pet which can result in unpleasant accidents with more aggressive dogs whereas too short leashes are uncomfortable for both the dog and the owner. The perfect leash can restrain the dog but at the same time is not viewed as a punishment for the pet.[9]
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:
For the price, the reviews are outstanding, with many owners agreeing that the Pets Lovers Club leash is the best they’ve ever owned. One owner says it’s even eliminated the wrist pain associated with strong-willed dogs. All in all, we think the Pets Lovers Club leash is a great heavy duty leash for nearly every dog and every situation — at a great price to boot.

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