I'm going to lie to my mom about my cats having fleas.
Why would you lie to your mom about that?
I'm worried about what she'll think.
That could upset your mom. It's better to be honest with her about the situation.
What if she think I don't know how to take care of my cat?
Pets get fleas all the time. It's perfectly normal and doesn't mean you don't take good care of your cat. I'm sure your mom will understand if you tell her the issue and are working to get rid of the fleas.