I probally noticed the difference the most on the old dog, but obviously older dogs would tend to be a bit stiffer after a hard day or night. I know what your saying about having a good dry kennel and the dogs seem fine, but when some people say my dogs don't need one ant there ok. Granted, there probally still alive in the morning, but they could have been shivering all night and most owners would be none the wizer. To be fair though charts, your dogs look pretty rugged with decent coats where as mine are quite thin coated things.