Which cooling mat?

[Medievalist]

My 12 year old lab suffers greatly in the heat so now it's starting to get warmer I was thinking of getting a cooling mat for her (though she's so contrary she probably won't use it ...)

She's quite arthritic and has taken to sleeping on the hard wooden kitchen floor rather than her nice memory foam bed - presumably because it's cooler.

But there are just so many out there! Does anyone have any recommendations? Do they actually work?

Thanks Annunaki , but it's a mat I'm after rather than a pillow. I've seen threads about them before and they've had mixed reviews - some people say they split easily. So I was wondering if there's a good brand to go for.