It is recommended by top breeders to avoid putting a collar and leash on your new puppy.
Your new puppy will naturally follow you wherever you walk using their innate pack instinct. Teaching her to follow will give her the self esteem she needs to grow into a well-behaved adult dog that you are happy to have. No one wants an unruly dog that bolts every chance they get. Keep your puppy safe by teaching her to stay with you off leash.
If you live in a heavily populated area, such as a city or neighborhood with strict leash laws, I recommend you take your puppy to a dog park for this essential training. The choice to buy her a walking harness due to regulations where you reside, choose a more a comfortable not too tight harness on your puppy for walking. The collar or walking harness attaches to the leash, for those rare times when you will need to walk your pup.
Depending on the breed of your puppy, the first few collars pick up an adjustable nylon type with a two-piece buckle. The collar should fit snugly so it won’t slip off you should be able to fit two fingers between the collar and the pup’s neck. Remember to check for the two-finger fit as your puppy grows.