My little yorkie Snickers had developed a big nasty barking habit. He would seem to have social anxiety and bark his little head off when he could not figure out where I was or wanted me in another spot from where I was. I love the little guy and I understand he is 11 years old but the constant barking was really wearing on us all. This collar has truly been a lifesaver. There is no shock at all. It simple vibrates and beeps and I absolutely love it. I am so thankful it helping to make our lives so much better so we can enjoy our Snickers instead of being frustrated with him all the time. I have linked my Youtube video review and included a link to view and purchase on Amazon. If you have bark issues I urge you to check it out. They also have other sizes but Snickers has a small!