What size collar do Chihuahuas need?

What size collar do Chihuahuas need?
Chihuahuas need a collar that is three-eighths to five-eighths of an inch wide, and can be adjusted to fit a neck circumference of six to 10 inches. Since they are a small breed, it’s important to choose a collar that’s not too heavy or bulky. Look for soft, lightweight materials, such as nylon or leather, that will fit comfortably around their delicate necks.
For a secure fit, the collar should be snug enough to prevent slipping, but not so tight that it causes discomfort. A good rule of thumb is to make sure you can fit two fingers between the collar and your dog’s neck. Many pet parents also opt for harnesses for Chihuahuas, since their small necks and delicate trachea make them more prone to neck injuries from pulling on a collar.