Measure girth (full circle all the way around body, directly behind your pet's front legs), confirm weight, then determine size.

To fit, place BB on ground topside down and position front legs through holes. The buckle always goes to your pet's left paw.

Wrap BB around body and fasten it between your pet's shoulder blades. An ideal fit will allow enough room for a finger or two to slip underneath when you give a light tug up on the sliding o-ring.

When buckled, the BB should comfortably fasten at one of the three middle holes. There are five holes in total. If your dog is still growing the tightest hole is acceptable, as long as the BB still fits snugly. If your dog is wearing the BB over top of a sweater, the end hole is acceptable.

Lastly, attach leash to sliding o-ring. Pet tags can also be attached here.