I'm looking for ideas to keep our beloved Lab cool and comfortable this summer. He's getting older and I can tell by the way he walks that his normal summer tactic of sleeping on the wood or tile floors is hurting his joints. He's never been particularly heat-tolerant, even in his younger days, although his overall health is good. We don't have central air conditioning and can't afford to run the window AC every day that it's over 80.

I'm sure someone out there in TE-land has dealt with something similar, and I'm grateful for any suggestions or advice.