Moving, rescue, boarding: should you put several cats in the same carrier?
Published by Planète Pets · managing editor: Clément Lacaille · how our guides are written
Moving house with several cats, rescuing a litter, a group pickup from boarding: the temptation to save space by putting several cats into a single carrier comes up often. A literature review published in 2022 by Tateo, Nanni Costa and Padalino in the Italian Journal of Animal Science gathered the available scientific data on the welfare of dogs and cats during transport in Europe, and directly informs this question (see the study). Our other guidance on the topic is gathered in the cat travel and safety section.
Contents · 5 sections
Transport is a documented stressor even for a single cat
The first point this review reaffirms: transport alone is a measurable source of stress for a cat — heart-rate changes, thermoregulation difficulties, fear-related behaviour — independent of any other variable. That's the same premise behind our article on choosing between a soft carrier and a hard carrier: the container alone never neutralises the stress of the journey, it only softens it.
Grouping unfamiliar cats together makes it worse
The most useful point in this review for anyone transporting several cats at once: forcing unfamiliar animals to cohabit in a confined transport space tends to multiply stress, notably through redirected aggression — an already anxious cat takes its tension out on the nearest cat, unable to flee the real source of stress. The authors recommend limiting the grouping of animals that do not know each other within the same transport space, a conclusion that echoes the well-documented warnings already given for cohabitation at home.
What this means in practice on transport day
For two cats that already share the same bed or sleep curled up against each other daily, a shared carrier large enough for each to move apart remains a reasonable option. For cats that don't know each other — a rescued litter picked up the same day, cats from different foster homes, two cats from the same building with no bond — one carrier per cat markedly limits the risk that an already stressful trip ends in a fight inside a closed space, out of the driver's sight. This is especially true during a move with several cats, where the stress of relocating already piles on top of the stress of the journey itself.
The limits of this review
This is a general-purpose literature review, built primarily around the regulatory framework for professional transport (breeding, shelters, carriers) in Europe, not an experimental study dedicated solely to a companion cat sharing a carrier with another cat. It gives no precise figure for space or maximum duration for a two-cat trip: it is a qualitative recommendation, drawn from a body of converging data, to be applied with common sense according to the actual relationship between the cats involved.
Frequently asked questions
Can two kittens from the same litter travel together?
This is the most favourable case: unweaned or just-weaned kittens, used to sleeping in a pile, generally tolerate a shared carrier better than two unfamiliar adults.
What's the safest option when in doubt about how two cats get along?
One carrier each: the extra cost or bulk is minor compared with the risk of injury from redirected aggression during the trip. Find all our guides on the cat hub.
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For your cat, at Le Félin (same family, zero commission): Arbre à chat XXL solide (from €169.99)
This guide is part of Planète Pets’s Cats universe. Our advice is general in nature: for any health concern, your veterinarian remains the only reference.