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Remove your rabbit from the heat. Cool your rabbit's fur. Offer water to drink. Know when to get medical attention.
If you suspect your rabbit has heat stroke, you need to immediately cool him down. Start by bringing him out of the heat into a cooler environment. For example, if your rabbit is in a room with full sun, move him into a shady air-conditioned room. While you may think you should rush to the vet right away, start cooling your rabbit down before you take him. Use a fan to blow cool air over his fur, paying attention to his ears. This will help lower your rabbit's body temperature. You can also dampen his fur with cool water before blowing air over it to cool your rabbit more effectively. Don't apply ice or ice-water because the extreme temperature change could send your rabbit into shock. Give your water plenty of fresh cool drinking water. Place the bottle water dropper beside him so he doesn't have to move far to drink. You may also set out a bowl of water so your rabbit can choose between it and the bottle water dropper. The main thing is to keep your rabbit hydrated. You can also put ice cubes in the water to keep the water chilly. At the first sign of heat stroke (as soon as you recognize symptoms), move the rabbit to a cooler area and contact the veterinarian. Since heat stroke can become lethal very quickly, your rabbit needs immediate veterinary care. In extreme cases, the vet may put your rabbit onto intravenous fluids which can cool his blood and support organ function.