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XXS Collars - usually fit dogs between 0 & 10lbs

XS Collars - usually fit dogs between 10 & 20lbs

Small Collars - usually fit dogs between 15 & 30lbs

Medium Collars usually fit dogs between 30 & 60ish lbs

Large Collars usually fit dogs from 65 pounds and up

Wide Medium & Wide Large Collars are 1.5 Inches Wide