You should warn guests of your pets when they arrive.
Tina recently adopted a new cat, knowing that her friend Lori is allergic to cats.
Tina wants Lori to come over.
Tina tells Lori she recently adopted a cat, and asks if she wants to come over.
Tina invites Lori over without informing her of her new cat.
Lori arrives prepared with allergy medicine and enjoys an afternoon with Tina.
Lori suffers a really bad allergic reaction to Tina's cat.