Review on GoodBoy Small Size Remote Dog Collar - Beep, Vibration, and Shock Modes – Effective Pet Behavior Training Tool - Waterproof & 1000 Feet Range - Suitable for Dogs Over 10 lbs - Small, Medium or Large Size by Tamara Simms

Fits my 12 lb shorky perfectly. I bought another one and it was too big. It's much easier to use large display numbers in this case. Fewer buttons. I really hated the idea of those collars but my shorts were misbehaving and this was my last resort. I tried the bit on myself before using it on him. Enough for him to feel it. I would start with failure, then use vibration, then shock (at the lowest level it would feel). In total it was necessary to use zap 3 times, now just say "no" and the vibration and its behavior will stop. game changer. With a new grandson, I was afraid that it would not work. Well, now I don't have to think about it. Thank you for this product.