Have Cat Questions? Ask a Cat Vet Online.
Hello, this is Dr. Jess. I am sorry to hear about your kitty! Do you happen to have a thermometer at home that you can take his temperature with? A regular digital thermometer can be used rectally, if lubricated with vaseline/ky jelly/etc and inserted approximately an inch or so into the rectum. This can help determine how truly overheated your kitty is. In the meantime, while you try to see if you have a thermometer, if you have any type of fan, you can position it so it is blowing directly on your kitty.
Is your kitty able to stand and walk around or is he unable to do so? If you look at his tongue/gums, are they pink? bright red?
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If your kitty is still panting excessively, if he is unable to stand up or when he does has a drunken/staggering walk, if his gums/tongue are bright red, or if he has vomited, these are signs of heat exhaustion. You should cool him with cool (not cold or ice) water all over his body in the sink or tub, being careful not to get water in his nose or mouth. You should then seek emergency veterinary care. Here is an article on heat stroke in cats:http://www.petmd.com/cat/emergency/common-emergencies/e_ct_heat_stroke.
If your kitty is panting but is not lethargic/is acting normally otherwise, keep him in a cool place with access to water, and continue to monitor closely. If the panting is not improving or he does become lethargic/staggering gait/has vomiting, then emergency care should be sought.