What is the first symptom to look for to be concerned that a rabbit is too hot? I was looking at respiration rate but I have a caged rabbit that is in a temperature of about 78 degrees F that started breathing about 3X faster but still shallow and tried a couple things: I gave her a large aluminum plate to sit on but she did not use it, I gave her a small quiet fan in a large room (of her 3 room cage). First she sit on the far side to get a very gentle breeze then she went to a room where she has never stayed for long so I think she wants to avoid the fan. I reciently got her from a shelter and she does not want me to touch her but I did use a IR thermometer to estimate ear temperature, about 92 to 94 at base, 90 at tip. I repeated this measurement on my free roam rabbit who is breathing normally and goes to the basement whenever she wants with the same result.