Worked first time round
I am quite impressed with how quickly we were able to see results for our Pug cross Mini Fox Terrier. We did an initial test run where we placed the collar on my dog, closed the door and pretended to leave the house and premises. He barked once, we waited for about 5 minutes, and he didn't bark again. Normally at this stage he would be barking continuously but we didn't hear a sound. Needless to say we were quite amazed and extremely happy; as are our neighbours. He doesn't detest the collar, which is good, but he knows that when it goes on not to bark and howl when we're away. It's lightweight, small and compact, incredibly easy to use and extremely useful especially if you live in an apartment.