With summer heating up, be aware that rabbits are extremely sensitive to the heat, and if they don't have a way to cool off, they can die. There are many ways, however, to help them cool down, if you have an outdoor bunny. One great way is to fill a 2 liter soda bottle with water, freeze it, and place it next to your bunny's favorite resting spot. (Depending on how hot it is outside, you may need to change it every couple of hours.) Also, make sure to always have plenty of water available to your bunny, preferably in a dish. (Ceramic crocks work well since they're tough for bunnies to knock over.) This way, they can put their feet or ears in the water, which is another way to help them cool off.
Bunnies are creatures of habit, so if you're traveling with your bunny, make sure to have all of his or her favorite toys, treats, and food. Changing food can upset a bunny's stomach, oftentimes causing diarrhea, which can quickly dehydrate a bunny (and can lead to death). Make sure to keep the routine as close to normal as possible, and this will help your bunny travel.
Another thing to keep in mind: never EVER leave your bunny in a car. On an 80 degree day, within just a few minutes, the car can heat up to over 120 degrees. Keep your bunny safe - if you go to a restaurant, make sure it's pet friendly. It doesn't take long for animals to overheat with temperatures like that.
Use common sense when taking care of your pet, and remember that with a thick fur coat, bunnies don't do well in heat at all. If you have an outdoor bunny, take the necessary precautions to keep your bunny healthy and happy. Take care of your pet, and you'll be able to enjoy his or her companionship for 12 years or more.