The Kuranda dog beds were great when I was at a dog rescue! Easy to clean, the 'outdoor mesh' fabric helps keep the dogs cool, they're chew-proof and water-proof... They can be pricey, but if you're keeping an eye out for a few months, you can probably snag a discount, or find used ones Facebook Marketplace/Craigslist/Nextdoor, or even fund-raise to buy some.
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