I installed a doggie door for my two little canine critters. They've used doggie doors all their lives, but they seem to be having a difficult time adjusting to this new one. Partially blind and a bit senile, 16 1/2 year old Oliver is having a difficult time finding the door. And 11 1/2 year old Murphy is having fear issues. The magnet at the bottom of the opening makes a loud clunking noise and Murphy finds it to be be very scarey. Oliver has found his way through the door a few times today. YEAY Ollie!! And a little bit of tape has helped quiet the clunking noise, which is making it a little easier for Murphy.