The open door of your drying machine, the cat can go inside to hide and sleep in a warm place. By accident you could start the machine with the cat inside.
Don't leave open your bottles or boxes of cleaning products. In powder or liquid they are all poisonous.
Anti-freeze and windshield washer should never be emptied on the ground, it's poison.
Windows should not be open high enough that a cat can pass the head, if it succeed it can get stuck and hang. Also a cat can tear apart easily a screen and ran away. A good way is to place a gate for children in the window.
If your cat goes outside in the winter, check that it's not hiding under the hood of your car to find warmth. The cat will get cut in pieces when you will start the car by the fan of the radiator.
Don't let the cats jump on the counter in the kitchen, they will learn very fast to jump on the stove to lick the top and sometimes the burners are still hot. They will get burn.
All that is thread, wool, lace, ribbon, cord, the cat while playing will gobble it and will not be able to take it out, it's very dangerous to choke.
Medication are attractive to cats, they will want to play with the small rolling bottles, these can open and they can eat the pills.
Some plants are poisonous for cats, ask your florist before buying one.
When you enter in the house, if your cat live freely, open the door slowly, it might be waiting for you behind this door.
If you spray yourself with an insect repellent or a solar cream, don't let the cat lick you, it's poison.
When you treat your grass against bad herbs or that you spay between your patio bricks, don't let the cat walk on it, it would burn the pad of its feet.
Be careful about chicken bones, they can get stuck in the mouth, the cat could not eat or drink anymore. Remove the bones before serving chicken.
Moth balls are poison for your cat.
Don't leave drawer open and wardrobe door open. Cats can hide inside and when you will close them, they will get trapped inside.