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If your rabbit is suffering from heat stroke, you may notice something is wrong without realizing exactly what it is. Your rabbit may seem extremely stressed, listless, quiet, and confused. Take care when handling your anxious rabbit. Any rough handling or extra stress could cause health damage. Look for fast breathing that seems like your rabbit is panting. Your rabbit may only be able to take rapid shallow breaths while keeping his mouth open. This means he's breathing through flared nostrils. He may also toss his head from side to side while he struggles to breathe. If your rabbit concentrates very hard on breathing, he may forget that he needs to swallow. This causes him to drool or salivate. This difficulty breathing and drooling is a strong sign of heat stroke. The fur around your rabbit's nose and nostrils may also be wet if he has heat stroke. If your rabbit has heat stroke, he probably won't move around very much. When he does move, he might be slow and seem uncoordinated. Your rabbit might be wobbly or weak on his legs. Some rabbits tremble, shiver, or have convulsions because of heat stroke. Look at the thinly furred inner part of your rabbit's ears. You should be able to see small blood vessels in the skin which give the ears a pink, red, or flushed appearance. This is because heat stroke can cause the blood vessels to dilate (get larger). The ears will also feel hot to the touch. The rabbit's fur may seem dull and starry (ruffled or spiky). To decide if heat stroke is likely, ask yourself whether it's a hot day. If so, think about whether or not your rabbit has been in the direct sun. Think about if he has access to water and shade. These factors can help you determine how serious the risk of heat stroke might be and what you'll need to do to help your rabbit.
Pay attention to your rabbit's behavior. Monitor your rabbit's breathing. Look for drooling. Watch your rabbit's movements. Check your rabbit's ears. Consider the weather.