Measure your dog’s neck before ordering a collar. Wrap a soft measuring tape around the base of the neck, just below the ears, where the collar would naturally sit. Insert two fingers between the tape and the dog’s neck to ensure the collar won’t be too tight but still snug enough to prevent slipping. For growing puppies, check measurements regularly to ensure the collar isn’t becoming too tight over time. If you don’t have a measuring tape, a piece of string and a ruler will work just as well. Always refer to manufacturer sizing charts to confirm fit, especially for collars designed for specific breed sizes. Choosing an adjustable collar is important for dogs with thicker fur to allow adjustments after being groomed and a haircut.