Warm weather is coming so are you and your bunny prepared?
Many people think sun is good for rabbits, but it can be deadly. Rabbits don't sweat. Their only way to release excess body heat is through their ears. Blood flows through the ears, which can be large, to get cool and then flows through body to lower the body temperature. The average rule of thumb is no more than 85 degrees air temperature and no direct sun.

Living Quarters/Play Areas
So the first area to look at is their house and play area. If they are housed indoors, make sure during the day their cage is not where sun comes in directly. And remember, the sun moves, so early in the day it may be fine, but not later. Shade them or close the blinds or curtains if needed, but don't leave them in the dark. Good ventilation is also important especially with high humidity. If the room is uncomfortable for you, then they probably are uncomfortable too. If they are outside, same goes for no direct sun and watch how the sun travels during the day. Provide them with shaded spots if in play area and ALWAYS provide them with water.

Overheating
If your rabbit is becoming overheated, it will pant, stretch out and start to breathe rapidly. If only slight cooling is needed, have a frozen plastic bottle filled with water ready to put in their cage (1 or 2 L) so they can lay next to it. You can soak bricks in cold water and put them in refrigerator and then line the bottom of cage with them so they can lay on the bricks. Misting a rabbit with water can help, but don't soak the bunny and don't leave bunny wet at night. Soaking burlap bags in water and then blowing air through them can reduce the air temperature. Place them over the front of cage and remove when not needed.

If it's heatstroke, they will be panting and maybe foaming at the mouth and possibly unconscious. This is an EMERGENCY. Get them out of sun, wrap the ears in a cool, wet towel. You can place a wet towel on the body and get them to drink water if conscious. A trip to the vet may be needed for further attention.

Car Travel
Travel in the car is also a concern. Again, avoid direct sun while moving, run the air conditioner, keep windows down, and never leave bunny in a car unattended.

A tragedy could be prevented by paying attention to your rabbit's, environment and being aware of the heat.