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When the weather heats up, common sense would tell you that you can keep your dog cool by getting rid of some of that heavy fur and sprinkling some water on them. Common sense is wrong in this case, and it's potentially dangerous.
As much as a dog's fur coat is meant to keep them warm, it also helps keep them cool when it's hot and prevents sunburns.
Most experts say that dogs with especially thick coats may need a trim, but they shouldn't ever need a completely shave, and short-haired dogs probably don't need you to trim them at all. They recommend leaving at least an inch of fur.
As for getting dogs wet, it will provide some temporary relief, but their coats can trap water, which can create steam next to their skin and only heat them up more. If you want to cool off your dog, apply cool -- not cold -- water to their exposed skin. This includes the armpits, paws, inner thighs, and places where there's no fur cover.
If you must wet your dog's fur, you'll need to continuously refresh the water so that it stays cool and doesn't create steam. If you're using a towel, you can trap even more steam if you don't keep it cool, and heat can transfer very quickly.
Get your dog indoors and to a cool place as soon as possible if they show signs of heatstroke or dehydration and give them plenty of water to drink. Don't make the mistake of making your dog warmer when you're trying to keep them cool.