I never saw a citronella collar that I thought was small enough for a yorkie.
When Coby was little we started with one of the sonic (high pitched sound) devices. That frightened him way too much. So we switched to the coins in the can. Worked great for a couple of months. Then that stopped working, so I used a squirt water bottle. That worked great until about a month ago and it lost its effectiveness. So now we're back on the sonic device which is working great!! I guess Coby's training is like shampoo - you have to change every once in a while or it loses its effectiveness!
