Plenty of UK homes have more than one cat, and many owners quietly wonder whether their cats are as happy together as they seem. A Bristol study that followed cats from kittenhood found that living with other cats was not, in itself, a risk to their health or behaviour. What mattered was how the cats got on. A second study of young cats found lower stress scores in multi-cat homes than in single-cat homes.

Multi-Cat Household

Cats descend from a largely solitary wildcat, and they took to group living where food was plentiful around human settlements. They don't form ranked packs. They prefer loose arrangements where each cat can get to what it needs without a confrontation. It is more like flatmates who respect each other's space than a family with a pecking order. The quality of the relationship between cats, not the number of cats, is what decides how stressful a shared home is.

Designing Spaces for Different Personalities

Every cat has its own preferences for how it uses a home. A layout that suits one cat's habits may leave another without anywhere it feels comfortable.

Some cats like to survey the room from above. A tall cat tree near a window suits this sort of cat. So do shelves at different heights and access to the top of a wardrobe or bookcase. In a multi-cat home, a cat on a high perch can watch what is going on from a safe distance and slip away if it wants to.

Not every cat is a climber. Some prefer a bed in a quiet corner, a favourite armchair or a patch of floor where the sun lands in the afternoon. These cats need spots of their own that a bolder housemate won't take over. And shy cats need somewhere to disappear to altogether.

Where the essentials go is the other half of it, and a study of stress hormones in shelter cats gives a fair pointer to what crowding does...

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Research rating: ⭐⭐⭐⭐ (4 of 5). Last updated 25 August 2026.

Sources

  • Blasco, X., Manteca, X., López-Béjar, M., et al. Intestinal Parasites and Fecal Cortisol Metabolites in Multi-Unowned-Cat Environments: The Impact of Housing Conditions. https://doi.org/10.3390/ani11051300
  • Khoddami, S., Kiser, M. C., & Moody, C. M. Why can't we be friends? Exploring factors associated with cat owners' perceptions of the cat-cat relationship in two-cat households. https://doi.org/10.3389/fvets.2023.1128757
  • Ozgunay, S., Murray, J.K., Rowe, E., et al. Cognitive and Composite Behavioural Welfare Assessments of Pet Cats between the Ages of 9–22 Months, Living in Single and Multi-Cat Households. https://doi.org/10.3390/ani11061793
  • Roberts, C., Gruffydd-Jones, T., Williams, J., & Murray, J. K. Influence of living in a multicat household on health and behaviour in a cohort of cats from the United Kingdom. https://doi.org/10.1136/vr.104801