I provide a cooling pad (which she doesn’t like, unfortunately) and much water. I have an ice machine that can make small amounts of ice for her water.
After hurricane Irma during the power outage I took Chopper's bed away and all soft surfaces and then laid down wet towels on my area rug which stayed cool all day. Luckily I have hard floors in all rooms but the bedrooms so he was forced to lay on the hard cool floors or the wet towels. Took him a bit to adjust but he got used to it.
I also froze a paper OJ container of water and then in the morning tore off the paper and placed that inside of his bowl. It thawed throughout the day keeping his water cold at all times.
Someone told me to put tin foil on the windows shiny side out but that never worked. Maybe search some ways people stay naturally cool without AC in hotter areas like Austrailia. Many people out that way like the zero waste, minimumal usuage, tiny house, solar types of living and have some amazing tricks!
Anyway to shade the windows from outside at all? Or maybe position a sun shade for a car or reflectix (which you can buy on Amazon) around the window so that it reflects the sun and shades them. Unfortantly from the inside the windows are already hot but could help.
I would also maybe try a few brands of a cooling mat or buy a few and lay them around in areas so it gives the dog less of a choice?
The windows in this room are small and open sideways with a crank (the building was made before 1930ish) so my A/C unit won’t fit (and obviously it can’t be sideways).
Buy a standing inside AC! My therapist has one in his office and the office loaned me one when my AC went out!
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You can put it sideways and it adjusts down to as small as the hose. They are priced differently at different places.
Can also try one of these. Cooling naturally through evaportation:
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They have an as seen on tv but smaller:
Arctic Air™ | Quick and Easy Way to Cool Any Space!
ETA: Oh, and keep your dog wet as much as possible! It cools via evaporation naturally. After Irma I soaked Chopper twice a day. Once in the morning before work and once in the evening when I got home. Both times with the water that was the ice so cold. I also kept a cooling rag soaked in ince water around his neck and did same with his bandada and also did not use his crate so that he could have as much area flow and free access to more water as possible.
Will your service dog be worked during the day at classes? If so, will there be AC in them? If so, that will certianly help. Try to find areas with AC and hard floors to let your dog lay on and cool off. And not sure what breed (as you shouldn't shave a double coat) but if a breed with the ability to be shaved, keep the coat shaved and short at all times. Make sure the belly is the shortest possible so the dog can lay on its belly and cool off.