I visited the link you mentioned in your post. The bed is good, but the price of the bed is quite expensive. I recently bought a bed for my dog from My Pillow Coupons. They have a wide range of quality bed for pets at discounted price.
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In Summer, the higher temperatures make the issue of keeping cool, compounded for our dogs, what with their extra layer - and in some breeds 2 layers - of heat-trapping fur contributing to the problem.shower him cold water all the time
Added to this is an elevated risk at such times, notably in the summer, of our dogs becoming sunburnt; particularly on vulnerable areas like their noses. And of course areas of skin on dogs with thinner, and in some breeds little, fur.
There are plenty of ways to try to help our dogs keep cooler. Mine like ice cubes, particularly if they have meat juices frozen!
Battersea Dogs & Cats Home have a useful article with tips on caring for your dogs in Summer which may be read here:
Summer dog care
Blue Cross also have a useful article called How to keep dogs cool in the summer heat