Litter tray, in particular for cats, comprising: - a drain pan having a bottom that is inclined towards at least one lower liquid discharge passage; - a box having: -- an upper compartment to accommodate the drain pan; -- a lower compartment facing said discharge passage when the drain pan occupies a fixed position referred to as a functional position within the upper compartment; -- a liquid collecting drawer, the lower compartment being adapted to house the collecting drawer below the upper compartment; characterised in that the box has a first side opening defining an access to the lower compartment and at least one second side opening through which the upper compartment opens out onto the outside of the box, the drain pan and/or a screen stackable on the drain pan being able to move by sliding in relation to the box through said second side opening to move from one position to the other between a position outside of the box, allowing it to be maintained separately from the drain pan and/or the screen, and said functional position, and in that the lower compartment is narrower than the upper compartment by being defined by the side walls (14, 15, 16) of the box, said side walls having an upper edge at the level of which the upper compartment opens out into the lower compartment, the lower compartment comprising at least two of the side walls (14, 15), each having an upper edge that protrudes in relation to the collecting drawer to support the drain pan. - a drain pan having a bottom that is inclined towards at least one lower liquid discharge passage; - a box having: -- an upper compartment to accommodate the drain pan; -- a lower compartment facing said discharge passage when the drain pan occupies a fixed position referred to as a functional position within the upper compartment; -- a liquid collecting drawer, the lower compartment being adapted to house the collecting drawer below the upper compartment; characterised in that the box has a first side opening defining an access to the lower compartment and at least one second side opening through which the upper compartment opens out onto the outside of the box, the drain pan and/or a screen stackable on the drain pan being able to move by sliding in relation to the box through said second side opening to move from one position to the other between a position outside of the box, allowing it to be maintained separately from the drain pan and/or the screen, and said functional position, and in that the lower compartment is narrower than the upper compartment by being defined by the side walls (14, 15, 16) of the box, said side walls having an upper edge at the level of which the upper compartment opens out into the lower compartment, the lower compartment comprising at least two of the side walls (14, 15), each having an upper edge that protrudes in relation to the collecting drawer to support the drain pan. -- an upper compartment to accommodate the drain pan; -- a lower compartment facing said discharge passage when the drain pan occupies a fixed position referred to as a functional position within the upper compartment; -- a liquid collecting drawer, the lower compartment being adapted to house the collecting drawer below the upper compartment;