I purchased this product for a terrier-schnauzer mix (male) who is a great dog, he just barks way too much and once he gets started he will not stop. From day 1 this collar limited his barking to almost nothing! I follow the instructions and remove it for part of the day. I was also able to turn down the adjustable power of the shock to the lower settings after the first day. Easy to use, instructions are complete and informative. Plastic collar easy to keep clean.