Review on CATOOP Premium Dog Doorbells: Easy Potty Training Bell for Big Dogs - Adjustable & Extra Loud - High-Quality Training Aid with 7 Extra Large Bells by Christina Moreno

Does exactly what it's supposed to do. We have a Danif puppy and he did a great potty training first and then went back due to the cold winter snow. Ordered this and for the first week or so he was terrified of the sound of the bell haha I would call out and take his paw to touch it before releasing it. Now that he is 4 months old he comes up and rushes to call when I am busy with something to let him out. I can tape the bottom to the door just because it wobbles and knocks on the door when I open and close it, but overall I would recommend this to anyone trying to potty train! It requires effort from both the owner and the pet, but with constant use, they take root immediately!