Our cat Raph acting tough and protective. He's an indoor cat and doesn't interact well with people so hissing and growling at people is constant. BTW he does scratch...Not just show but go...
My cat Jazzy (Jazmine) always growls at door or windows when she hears anything outside, like people talking or someone walking on the porch. She's never hissed or tried to attack the windows though lol
My cat (who is the sweetest cat ever, by the way) did this and I was confused. Turns out it’s a warning for people to stay away from her kitten. She is an amazing mommy to her kitten!