https://play.google.com/store/apps/details?id=com.greatapps.dog.whistle

2.  Do you have a dog?
Teach your dog new tricks with
this simple to use dog whistle.
Stop dogs from barking! Initiate a
variety of frequency sounds. Set it
on your main screen as widget. You
can use it as anti dog repellent!

3.  Here is the link of DOG
WHISTLE Android App :
https://play.google.com/store/apps
/details?
id=com.greatapps.dog.whistle