Exceptional Product. My cat Mason developed Asthma and allergies before his first birthday. He took to this breathing apparatus the first time we used it. He has always been receptive to every challenge in his 3 years of life. Not only does he have asthma and allergies, but he has heart problems (two tears in his heart) and he was born with Cryptorchidism and an abdominal hernia. He has a cardiologist and an internal medicine doctor on call 24/7. I thank God for all the advances in science and those concerned about the care of our beloved animals. Mason is truly an Angel and is alive because of innovations like these.