This collar is for medium to large dogs only. MINIMUM LENGTH OF 11". By popular request, Fi compatible breakaway collars with breakaway clasp. This collar does NOT have a 2nd regular "quick clip" buckle - find those here. Collars without the 2nd buckle have greater adjustment range - great for smaller dogs and growing puppies.3/4", 1" or 1.5" wide, adjustable collar features a unique plastic breakaway clasp that will come loose if the wearer gets caught on something (fence, crate, heat vents, another animal, etc). Double D rings allow you to bypass the breakaway feature and safely use this collar with a leash! Don't know what a "Fi" is? Don't have a Fi but need a breakaway collar? Our Fi Compatible collars REQUIRE a Fi module. Order a 'standard'/non-Fi breakaway collar from this collection. *** DISCLAIMER *** USE AT YOUR OWN RISKBe sure your Fi is charged to prevent accidental loss! Breakaway collars WILL break away, probably when it's least convenient for you; this option may not be suitable for all dogs or situations. By purchasing, you acknowledge the risk of losing a Fi receiver if your dog is off leash in a large area. Refunds or replacements will not be given for lost collars or loss of your Fi receiver. Fox Valley Pet Wear breakaway collars come with a proprietary buckle reinforcement to prevent accidental breakaways more common with larger or heavier dogs (M-XL sizes only). Buckle reinforcements are removable, replaceable, and adjustable - instructions are included with purchase.Size & WidthMeasure your dog's neck or current collar. Choose appropriate size range & width. **Listed size ranges may vary up to 1/2". Stated size ranges are actual collar lengths - be sure to choose a size large enough to be comfortable for your pet. Mini Tag Ring Upgrade any collar, harness, or leash with this mini D-ring (3/8" wide inside diameter) to hang your pet's tags from. Reduces tag-to-buckle jingling; keeps your tags from hitting the buckle, keeping your buckle looking newer, longer; and frees up space on your D-ring for your leash! NOT RECOMMENDED FOR CATS.