Anal or armpit... they work in both.
Plus go to American Red Cross look for PET FIRST AID. There is info specific to heat & stroke.
As well as the instructions for care for all other illness and injuries for cats, dogs, etc.
Do you have emergency kits for each of your animals?
I use large plastic coffee jugs with pets names on top for small items.
Some things in boxes - in fact my bench in the front porch is now my emergency center.. its water proof and hold the Extra food dry & canned. spoons, can opener, etc are in extra large shopping bags.
Everything else is in the library.
I worked for SPCA in LA and been a certified RC instructor for humans and animals.
With all the extreme weather... its best to be prepared.
Just a friendly reminder. 8-)
Love All Life, Thank You For Posting! :)