Car travel is the most common and generally the most manageable way to transport fancy rats. A sturdy, well-ventilated carrier is the foundation of safe car travel with rats. Hard-sided small animal carriers with secure latches work well, as do modified plastic storage containers with ventilation holes drilled in the sides and lid. The carrier should be large enough for the rats to move around comfortably but small enough to prevent them from being tossed during sudden stops. Line the carrier with fleece or familiar bedding from their home cage to provide comfort and familiar scent.
Temperature regulation is the single most critical factor in car travel with rats. Rats are highly susceptible to heatstroke and can experience dangerous overheating at temperatures that humans find merely warm. Never leave rats unattended in a vehicle, even for a few minutes, as car interiors can reach lethal temperatures with alarming speed. During warm weather, run the air conditioning continuously and position the carrier in the coolest area of the vehicle, away from direct sunlight through windows. During cold weather, ensure the carrier is not placed directly against cold surfaces or in the path of frigid air from partially open windows.
For short trips such as veterinary visits, minimal preparation beyond a secure carrier and appropriate temperature is needed. For longer journeys, provide a water source — either a small water bottle attached to the carrier or moisture-rich foods like cucumber or watermelon pieces that provide hydration without the mess of spilled water. Pack a supply of their regular food, and offer small amounts during rest stops. Keep a small first aid kit accessible, including styptic powder, clean gauze, and your veterinarian's contact information.
Rats are social animals, and traveling with their cage mates reduces stress significantly. If you have a bonded group, transport them together rather than separating individuals into different carriers. The presence of familiar companions provides reassurance during the unfamiliar experience of vehicle travel. Some rats adapt to car travel quickly and become calm passengers, while others remain anxious throughout the journey. Covering the carrier with a light blanket can help nervous travelers feel more secure by reducing visual stimulation.