Finally, it's going to be a warm weekend in Chicago! Get out there and enjoy it with your dog!
But please remember: it is now officially warm enough that you should not leave your pets (or your kids!) in the car. They can develop heat stroke very quickly even with the windows cracked open or parked in the shade.
Exercise induced heat stroke is also very common in dogs when the weather first turns nice. Don't forget: Dogs don't sweat! They can't cool themselves off quickly. Prolonged vigorous exercise (chasing a frisbee or ball for example) can lead to heat stroke in dogs even when the weather is just getting warmer and not that humid. In most dogs, their enthusiasm far exceeds their common sense. It's up to you to make sure that they have plenty of water to drink and that they don't play so hard or long that they get sick.