Cat litter should never be disposed of in the woods, in forests, in fields or in your own garden. Clay-based litter is not capable of decomposing and the waste will not disintegrate. In contrast, plant-based cat litter is made from natural fibres such as wood, corn or straw, so its raw materials are biodegradable and compostable. Still, used and contaminated litter can contain toxoplasmosis pathogens: if cats have eaten raw meat, they can excrete oocytes in their faeces