My cat was the runt of his litter and he has always had a kind of rattly breath. It's been getting worse as he gets older and he seemed to really struggle for breath when the weather got colder. It turned out that he had a bad case of cat asthma and needed to be on regular medication. Once we found the right vet and the right treatment plan he got much better and I don´t have to worry about his breathing at night anymore. This blog has tips and hints for owners of cats with asthma and other respiratory problems.