Q. Can I give my dog ice water to drink?
A. Yes, of course you can. However, you do not want to give ice water to your dog when he is already overheating. If your dog is panting, shallow breaths, vomiting, displaying gums of a different color, having diarrhea, or lethargic, do not give him ice water. Ice, ice water, and very cold water all shock your dogs system, and constrict the blood vessels, making your dog hotter in-turn. It could turn deadly.
If your dog is acting normal, and in a cool room, feel free to give him some ice water, or ice cubes! There a fun treat, and you have nothing to worry about. It's truly only when they're very hot, or overheating.
FYI, if the dogs are vomiting, panting with shallow breaths, having diarrhea, etc.. please see a vet immediately.