In a multicat household, cats have to share their territory with other cats. This is a most unnatural behaviour for cats, who are not naturally inclined to develop social contacts.
Sharing their territory means losing control of resources, which is a fundamental need for cats. For example, cats living together often have their food bowls in the same location. If one cat doesn’t want to come into contact with another individual, he may be forced to wait until the other cat has eaten.
As a result both cats may eat quickly or change the amount they eat in one go. In some instances a cat may not feel comfortable enough to approach the feeding station at all and may go hungry or over-eat to prevent the other animal eating 'his' food.
A similar situation may be seen around the litter tray. During the elimination process, cats need privacy. Most will not feel comfortable enough to use a tray in a room other cats can enter at any time. They don’t want to be surprised by the other cat(s) in the elimination area. Consequently, they visit the litter tray as infrequently as possible and eliminate as quickly as they can, thus leading to inappropriate elimination (house-soiling) or potential medical conditions.
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