A:Answer While the collar itself can be adjusted for a smaller diameter neck, I personally feel that the prongs might be set too far apart for such a small neck and that perhaps it might seem a little heavy for your dog. So, I don't necessarily recommend this particular collar for a dog of that small size. I think it's a great collar, it features a vibrate only option and an auto-rising feature for the habitual, constant barker - or you can preset the intensity (settings 1-7). It does offer quick charging and it's really durable. We now have two of this model as it's been the most reliable of the others that we have had.