Whether you don't have a sprinkler, your dog doesn't enjoy it, or either of you aren't satisfied with just being tickled by the sprinkler streams, a kiddie pool is a great alternative. You can fill it up as much or as little as you want, control the temperature, and even throw ice in it if you want it to stay extra cold! Most dogs that have any interest in water will thoroughly appreciate having a place to soak and cool off.
If you've got a towel or a chair and sunscreen, don't be afraid to bake! Some dogs love being warm or hot and laying in the sun can be the perfect way to do so. Just make sure you both get enough water and don't get overexposed or you may end up with an unexpected pup-pie!
In Wisconsin, frozen custard has its own place on the food pyramid, somewhere near the bottom where it's considered a staple. As long as your dog isn't lactose intolerant, it's okay for them to eat a little ice cream. The flavor must be dog-appropriate and the product cannot contain xylitol. Try to keep it simple such as vanilla and avoid harmful choices like chocolate or anything with raisins. Just be careful, the sugar can still rot their teeth like it can yours, so make sure to brush afterwards to keep them both happy and healthy.