Leashes and collars come hand in hand.
Leashes like collars, are available in different colors, designs and sizes.
They are also made up of different materials such as leathers, nylons, hemps and metals.
A leash is actually one of the vital pieces of safety gear a dog owner must own.
It will keep him out of dangerous traffic and will remind him to keep from bolting out when walking.
A leash can control your dog from talking trash and initiating a fight with other dogs, and it can help get two dogs apart in case they squabble.
The best leash however is the one that is appropriate for your dog and will qualify to his behavior, size or breed.
It isalso important that the material suits your dog's need.
Here are some kinds of leashes which can be useful in your choice:

• For dogs who don't pull too hard, a nylon or cotton is the best choice for them.
  The cotton material is flexible and convenient for the hands, while nylon leash is tougher and stronger and provides more durability.
  But of course, both can easily be chewed into pieces.
  
• Leash made of leather are best for those dogs who pull often.
  Leathers tend to be soft with time but of course, it can also be chewed.
  
• Retractable leash allows your dog to stroll a little away from you during walking time safely.
  It's more like an adjustable leash, where you can shorten or lengthen it accordingly.
  The leash is quite long, which can be rolled up on a certain spool in a plastic handle.
  It then retracts and releases, then with a push of a button, it is locked into place.
  The leash can be quite useful but it actually teaches your favedog that it's okay to pull.
  
• Slip leash is one favorite and common leash that is very convenient.
  It is a leash and collar -in- one, ready to put on and can be immediately detached.
  They are usually for show or stray dogs, and also for those dogs who are not wearing any collar.
  Slip leash is not used to walk a dog and must be put on correctly or there is a tendency that it won't loosen quickly.
  
• A traffic leash is used if you want your dog to be near you and out of the traffic or crowd.
  It is approximately a foot long, very short so it can be more manageable.
  

In conclusion, a basic leash should at least conform to what your specifications are and that you buy them because of you and your dog's safety and protection.
Do not forget to evaluate and check the leash if there is any sign of a sunken dog tooth or if the leash is already a year old.
It may rip in half even if bitten lightly, or eventually tear and wear down with age.
Leashes were created for convenience while others have specified purposes.
The best dog leash is one that is properly sized for your dog and serves its purpose.