I have a male cat that is 12 years old. He has been having asthma attacks most of his life. At first I tried changing his food, and his cat litter - with no good results. I tried almost every dry & can food in the open market but he continued to have asthma attacks. I always tried to buy the best can & dry food out there. Grain free, limited ingredients, raw, home cooked, etc. I finally put my cat on steroid injections 3 times a year. It was the only thing that stopped his attacks for a short period of time. But then after about 3-4 months they would come back again. I Instinct Grain Free Rabbit, Instinct Ultimate Protein, Blue Wilderness, Wellness, Purina, Merrick, etc. Nothing worked and he kept having asthma attacks with all of these foods, Whether they were dry, wet, raw, homecooked, nothing made any difference. Until one day when I took him to the vet and my weighed 18 pounds after eating Instinct Ultimate Protein for almost a year or so. I thought it was really good for him. So I started looking for a weight loss food and came across Hills Science Diet Perfect Weight - Weight Management dry cat food. Both of my cats have been eating this food since February of 2020. Both of my cats a losing weight and my 12 year old male cat has not had even one asthma attack since eating this food. I noticed that a lot of the manufacturers of dry cat food, put carrots, apples, tomatoes, Parsley, Kelp, Blueberries, Cranberries, Barley Grass, Yucca Schidigera Extract, etc. You have to really be careful because I think cats - just like some people have allergies to certain foods. All I know is that my cat has not had another asthma attack since he has been eating Hills Science Diet Perfect Weight dry food. I will continue feeding him this food. Both my cats love this food and drink plenty of water daily. I have a flowing fountain and they drink water all the time. Both my cats are males and have not had any urinary problems eating this food twice a day. There fur feels likes rabbit fur. Every time I take cats to the vet they always remark about how soft my cats coats are. My cats have a lot of energy and look really healthy and are starting to lose weight. I'm extremely happy with this food and will continue to buy it.