Friend staying tomorrow for one night. Should I tell her my cat has fleas? Have treated the house today. Boiled all bed linen. Treated cat too of course (he's now slunk off in a sulk). Despite having cats for my whole life, I've never had this dilemma and not sure what to do. She's pregnant and Google tells me it's not harmful for the baby. I'll double check this with the vet in the morning and will immediately cancel if it is but going by the info I've currently given, should I let her know?