It works for my dog

Just got the app , my dog have the attitude that he listen sometimes , sometimes not as soon I got this app I instantly tested it and he listen when I command sit and stop biting .i have a yorkie and still a little
Puppy that is too hyper so having this app helps me a lot didnt think about this for long time I thought its just a joke I was already getting frustrated of the behavior to ask a trainer and Im still working on potty trained which is a working progress , at least I get a little
Help with this app it works for my dog.

Eun&Ty about Dog Whistle Free, v2.2