On these dangerous days, we limit the amount of time our doggy daycare dogs are outside..  We go out for about 5-10 minutes and then come back in to the air conditioning.  As always there is always plenty of water in all of the play rooms and we make sure everyone is getting enough water!

Many people have asked me what to do if their dog has heat stroke.

Signs of Heat Stroke

The following signs may indicate heat stroke in a dog:
Increased rectal temperature (over 104° requires action, over 106° is a dire emergency)
Vigorous panting
Dark red gums
Tacky or dry mucus membranes (specifically the gums)
Lying down and unwilling (or unable) to get up
Collapse and/or loss of consciousness
Thick saliva
Dizziness or disorientation

What to do if You Suspect Heat Stroke

If you have even the slightest suspicion that your dog is suffering from heat stoke, you must take immediate action.
First, move your dog out of the heat and away from the sun right away.
Begin cooling your dog by placing cool, wet rags or washcloths on the body - especially the foot pads and around the head.
DO NOT use ice or very cold water! Extreme cold can cause the blood vessels to constrict, preventing the body's core from cooling and actually causing the internal temperature to further rise. In addition, over-cooling can cause hypothermia, introducing a host of new problems. When the body temperature reaches 103°, stop cooling.
Offer your dog cool water, but do not force water into your dog's mouth.
Call or visit your vet right away - even if your dog seems better. Internal damage might not be obvious to the naked eye, so an exam is necessary (and further testing may be recommended).

Source - About.com