When kitty is stretched out on their back does this mean they want a belly rub? Not necessarily. Cats rarely lay this way as this is a very vulnerable position for them to be in. It is, however, a very strategic position for them to as it allows them all four paws, and sets of claws, for defense. Surprise a cat and this position and they may instinctively grab your arm with all four legs – no offence, it’s just a defense mechanism.
When you see your cat sleeping in this position they are saying that they are relaxed, happy, and very comfortable in their home.
To be safe, It’s best to not attempt a belly rub unless you know it will be welcomed.