BronzeDog Rope Dog Choke Collar, Braided Training Slip Collars for Dogs Small Medium Large Puppy (L - 21.7" Long)

My puppy's neck size is 13 1/4 ". she is a golden retriever @ 4.5 months old. would a small work or a medium size better?

What size is average for Scottie or Westie?

Where is the product made? Thanks.

Will this float in the water?