The Dog Whistler

On May 27th, 2022 while I was gone to an appointment, an evp was caught in the livingroom.
Hubby was in the bedroom surfing the web while my dog Taz was walking in from the back porch. As she neared the door (on left), a whistle can be heard along with what sounds like the word “ready”.
I confirmed through the outside and bedroom cams the sound was not generated elsewhere.
This clips audio was enhanced 30 decibels and has a slowed version attached.
Please excuse the purple square, its used to cover my messy table im using for crafting lol.