There are enough types of dog collars available that you should be
able to find one that perfectly suits you and your pet.
Understand that any type of collar and leash will do, as long as they are strong enough to hold your dog, fit properly and are not too heavy for your dog to carry.
There should be two fingers distance between collar and the dog. Its
good idea to measure like this.
Consider the type of breed your dog is and what color her fur is.
A fuzzy pink collar that would work for a toy poodle would probably
look silly on a Doberman.
Look at the price ranges, and decide how much you would like to pay.
Collars are priced starting at $10, depending on how fancy you want
yours to be.
Be certain you purchase a leash that is the right length for your dog. A very long leash will get tangled in a small dog's legs. A short leash will impede a big dog.
Ask the salesperson how durable the collar and leash will be. Decorative or glued-on items may have a tendency to fall off.
Check out some online stores to get a good idea of the wide variety
that is available. Look in Recommended Merchants for stores available
online.