How to choose a collar for the following pet automatic retractable leash, dog leash and pet leash manufacturers?
How to choose a collar
When the dog wears a collar, pay attention not to be too tight, because when the dog is suddenly running or rushing with excitement, the collar is too tight to cause damage to the dog. A suitable collar should have a space where the owner can put two fingers after the dog is worn.

Neck circumference measurement
When buying a collar, you will usually see a sign that says neck circumference x cm~x cm on the neck circumference. Generally, one number represents the length of the dog's chin parallel to the back of the neck, and two numbers represent the length of the parallel round from the junction of the neck and back.
1.5cm collar: neck circumference 26-33cm, suitable for small dogs.
2.0cm collar: 30-39cm neck circumference, suitable for medium-sized dogs.
2.5cm collar: 37-46cm neck circumference, suitable for large dogs.
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