i have had my cats for about 3 years. in the past couple of months they have been scratching my furniture and walls. the paint is even starting to chip off and the furniture has tags. i tried spraying the cats with water right away after so hopefully they can try and identify what they did was wrong, and even giving them a little slap with some news paper because the news paper makes a loud noise and is not harmful. but they still go at it. how do i stop them from ruining my house? and why did they start doing this all of a sudden? they are neutered. one likes to be out side and the other likes to be inside. they both do it. and i have noticed they have been getting a little sassy. they are starting to scratch my boyfriend i. that is intolerable. the other day my boyfriend was playing innocently with my cat and bit him on the hand. i could tell it was hard because he had teeth marks. that isn't the first time they have done this. they used to be so good. they still are but they have their moments. what can i do?