Petmate Light Weight Collar

The chain with rings at either end such that the collar can be formed into a loop that slips over the dogs head and rests around the top of the dog's neck, just behind the ears. When the leash is attached to the dead ring, the collar does not constrict on the dog's neck. When the leash is attached to the live ring, the chain slips (adjusts) tighter when pulled and slips looser when tension is released