FocusPet Automatic Humane Anti Bark Training Dog Bark Control Collar  (Small, Black)

Really helped me alot especially with living in the complex,

This works really well. Size is a bit too big, a small won’t fit your small dog. But there’s room to adjust it just looks funny on a small dog. With that said, try and start off with the lowest setting (0) and gradually go up. Introduce it in a safe environment to your dog. But yes, it picks up every single bark and it does not get triggered by other dogs at the park.