Carrier height and heat: what a rabbit transport study reveals about piling
Published by Planète Pets · managing editor: Clément Lacaille · how our guides are written
Owners often pick the tallest carrier available, thinking it offers more comfort, especially for a trip with several ferrets. A recent rabbit transport study shows that this extra height can, in hot weather, work against the animals rather than for them. Find all our safety guidance in the ferret travel and safety section.
Contents · 4 sections
What the study shows
Contreras-Jodar, Dalmau, Bagaria, Barbosa-Filho, Rendon, Salama and Velarde published a study in 2025 in Frontiers in Veterinary Science, on the simulated transport of 900 rabbits, crossing three space allowances (121, 150 and 191 cm² per kilogram), two container heights (20 and 35 cm) and four ambient temperatures, from 21.4 °C to 33.5 °C. The hottest treatment — 33.5 °C with 58% humidity — had to be stopped after five hours instead of eight, since heat stress threatened the survival of rabbits housed in the least spacious containers, a risk made worse in the taller container. The researchers observed that in tall containers, rabbits tended to pile on top of each other: those on top benefited from better airflow, while those underneath accumulated heat from their own bodies and their cage-mates’ bodies. Panting dissipates heat poorly in rabbits, which lack enough functional sweat glands, hence their reliance on other strategies such as ear vasodilation or postural changes.
Why this mechanism also applies to ferrets
This study doesn’t cover ferrets, but a lagomorph transported in groups in a farming context. The mechanism it isolates — a tall container that lets several animals stack on top of each other, combined with heat that pushes each one to seek the best possible airflow — stays relevant whenever several ferrets travel together in the same carrier, which is common for ferrets already cohabiting at home. A ferret also doesn’t regulate its temperature well through breathing alone, as our article on heat inside a travel carrier already covers.
In practice, before a trip in hot weather
- With several ferrets, favor a wide, low carrier rather than a tall, narrow one once the outside temperature climbs.
- Consider two separate carriers for a long summer trip, even if the ferrets normally travel well together.
- Make sure nothing blocks air circulation between the carrier floor and the animals, on top of the already known precautions against CO2 buildup in a sealed carrier.
- Watch for panting or lethargy during the trip, especially in whichever ferret ends up underneath if they pile up on their own.
Frequently asked questions
Does this study directly concern ferrets?
No, it covers rabbits transported in groups in a farming context; the piling and heat mechanism nonetheless remains transposable as a general principle.
Should multiple ferrets always travel in separate carriers?
Not systematically: the identified risk mainly depends on the combination of heat and carrier height, not simply on traveling together in mild weather.
Is a low carrier always preferable?
It limits the risk of piling in hot weather, but a carrier that’s too low is still unsuitable if it prevents the ferret from turning around comfortably. Find all our guides on the ferret hub.
See it in the Planète Pets shop: Bubble-window carrier backpack for dwarf rabbit, guinea pig or ferret (€47.90) · the whole shop
This guide is part of Planète Pets’s Ferrets universe. Our advice is general in nature: for any health concern, your veterinarian remains the only reference.
