There may be almost no research on pet aversion during and post-pregnancy, but it may not be particularly rare About three weeks into her first pregnancy, Sylvia Luu began to loathe the smell of her border collie mix, Ranger. Luu could hardly be in the same room as Ranger without becoming nauseous. His drool repulsed her, and she found the smell of his fur so disgusting she wore a nose plug all day.