They don't need a reason! We cat owners are supposed to be able to read their devious little minds anyway and they get very uppity if we don't anticipate their every wish.
LOL... puddicat.. yeah sure ! You slave (like the rest of us) you!
Now, imagine giving a dog a cuddle like you can give a cat...or even having a dog on your lap... (like a cat hehe)... purr purr purr.... ooohhhh that itchy bit around the ears is so nice when stroked....
OK, I give in, I am a slave to my wee mistresses... I love them dearly.. even when they are being absolutely horrible to me and not telling me what to do proper like see.. lol