Needs are the necessities of both Sims and pets, which reflect their overall mood. If these needs are not meet, these characters will become unhappy. Playable pets have eight following needs:
Bladder — fulfilled by reliving on the spot. Pets that have obedience will pee outside (cats will use a litter box if there is one), unless they don't manage to leave the house in time.
Comfort — fulfilled by sitting on a couch, relaxing or sleeping in a bed.
Energy – fulfilled by sleeping. Pets can sleep on the floor, although its best to get them their own respective pet bed so that they don't take over the owner's one. Such object may also benefit in replenishing the pet's energy need faster.
Fun – fulfilled by playing with another pet, a Sim, or with their respective pet toy.
Hunger: which is fulfilled by eating and drinking.
Hygiene – fulfilled by being washed. Cats can and will clean themselves on their own, while dogs require a Sim to wash them in a bathtub.
Social – fulfilled by socializing with Sims or other pets.
Scratch (cats only)