I ordered this product on the advice of my dog trainer and this necklace is really effective! However, the size WARNING! I have a white Swiss shepherd, size approximately 65 cm at the withers, a rather wide muzzle and size 3 is too big for him, making ineffective necklace! I suggest the size 2, which tightens a little busy but the work! If not advisable for all owners of dogs that pull.
