My dog loves to play in a kiddie pool filled with water and her favorite toys. It can be kind of messy when it comes time to let her back in the house, but I keep a towel at the door and I do it in an area with as little dirt as possible. It's kind of cute when she sticks her head almost entirely under the water in order to fetch her favorite ball.
I wait till about 5 or 6 in the evening to take Rusty out for his walk. When done, he marches right into the shower and gets a good cleaning and refreshing shower.He spends the next half hour diving into the carpet and rubbing everywhere and is cool and refreshed.
We have a wading pool. Some of the dogs like to use it to keep cool and some don't. Another thing dogs like is a lawn sprinkler set at a medium pressure and slow movement. They act like it is a living thing and can really get carried away jumping through the spray and trying to bite the water. A trick dogs love (not good for inside dogs, too messy) is to simply pour water on a bare patch of dirt. Dogs just love to dig in a damp spot and then lay in the hole they've made. We also use a frozen towel for our somewhat full-figured lab mix. She tends to race around at the slightest hint of fun (we can't figure out why she's fat, it's a mystery) and gets overheated fast. At this time of year we keep a damp towel in the freezer curved into a "U" shape and when she starts feeling the heat we take it out and hang it over her neck. She loves that thing and will tiptoe carefully around the house to keep it from falling off till the last bit of cold is gone.
Freeze water in 2 liter bottles and let them play with them. Also a pool is nice just make sure it is in the shade on the hottest days. or put the frozen bottle in the pool and that will keep the water cooler longer.
A Naples, Florida, man was convicted of cruelty when his dog died after being locked in a car for four hours on a warm day. I'm usually fairly sympathetic to people being convicted of crimes, but not this man. The judge felt the same way as I do. During the “dog days” of summer, the temperature inside a parked car can climb to well above 100ºF in just a matter of minutes. Heatstroke can come on quickly and result in brain damage or death. Animal control deals with hundreds of deaths every summer. Never leave a dog in a parked car. If you see a dog in a car and in distress, take down the car’s color, model, make, and license-plate number, have the owner paged inside nearby stores, and call local humane authorities or police. Don’t carry your dog in the bed of a pickup truck. Don’t take your dog jogging—except on cool mornings or evenings—and don’t force exercise. Trim heavy-coated dogs’ fur, but leave an inch for protection against insects and sunburn. Keep your dog indoors. Be a watchdog for chained dogs.
Mine love water, so they have a steel livestock water container. They also have 2shade trees with their houses underneath. They are always in the water, so when they come in, everyone sits and waits to be toweled off. It works great.