This action will startle any cat yours, or your neighbor's who cozied up to the warmth of the engine the night before. The dryer is a hazard few people recognize before it's too late. The cat crawls into the appliance to sleep on the warm clothes and isn't noticed when a family member adds a few more clothes or decides the ones already in there aren't dry enough. The door closes, the dryer turns on. Like a dog in a hot car, this is a horrible way to die.
Cats can be very good at masking signs of disease until they're so sick their lives are at risk.
When you notice a change in behavior, call your vet, right away. Probably the most common of these signs is a change in litterbox habits. I often get calls from people who are frustrated because their pet is suddenly using carpets or the bathtub for a litter box. A veterinary visit that catches a problem early is easier on both your bank account and your pet. Aspirin and acetaminophen are toxic to cats in amounts as small as one tablet.