Dog goggles are manufactured to help protect your dog's eyes from extreme UV exposure when outdoors for long periods of time. They are also manufactured to protect your dog's eyes from sand, dirt, and other unwanted objects.
Research shows that inadequate eye protection supplied for your dog when out in the sun for long periods of time can allow eye disease to develop in your dog. Goggles sold for dogs are required to block at least 50% of UV rays which provides sufficient protection for your dogs eyes. Also many dog goggles are shatter proof or resistant to ensure you and your dog of their eyes' safety.