Cats are a common cause of pet allergies. Proteins in cat saliva, urine and dried flakes of skin can cause allergic reactions to appear in just a few minutes. In other people, they can take several hours to develop.
To be the cat's whiskers 是一個老式表達，指某人成為了了不起的人物。
Mary thought she was the cat's whiskers in her new coat.
This is a posh school and everybody thinks its students are the cat's whiskers but the teachers know they are not!
在英語裏，人們用 look like something the cat dragged in 這個表達來形容某物很髒或看起來很邋遢。
My friends and I went to Rio last year during the Carnival. After partying all day and all night, we looked like something the cat dragged in.