Thank you everyone for your tips! I'm so glad I found this thread. Bella's constant barking is becoming such a problem. My sister and her two small children (3.5 yrs and 7 months) just moved in with us and her barking wakes them up at night. Bella barks at my dad when he just walks by her and she goes crazy at my bedroom door if someone even walks by. I tried the pennies in the can, spray bottle and the simple get up and tell her no. NOTHING has worked and it's getting worse! I'm going to try to see if I can find a spray collar that fits her, so if anyone finds one that would fit a 3lb Yorkie please let me know! Any other tips are welcome!