(1) Choosing depends on the pets' weights and external physical appearance.
Strong dogs : heavier and wider collar and leash.
Small dogs : lighter and narrower collar and leash.
(2) Choosing depends on the function.
Collar : it's better choosing the one that can be adjusted with the dogs' growth, avoiding the discomfort or strain that pose dangers to dogs.
Leash: adjustable length that avoids too long or too short.
Harness : next-to-the-skin Harness can avoid bites by dogs and these are popular for dogs that tend to pull while they are being walked. It is adjustable.
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