tucker is a 2 year old coonhound mix and I did get his vest as well as patches and service dog . I do have a letter from my audiologists as well as my primary care doctor to . tucker has all his shots as well as registration . I have trained pets before but tucker is my first dog that im am training currently my hearing impairment is 90% loss in right and 40% in left ear my disability is progressinal . currently im traing tucker to alert me to four cues my alarm clock, the door , my phone and a motion detectior at my work . but I also am naturally alerted by his natural instinct to turn his head at a sound or wild animal we do live in the country and get snakes, wolfs, deer, and coyotes so he instinct to look alerts me to look .