They are modeled after sports goggles and there are currently 2 styles of Doggles, fitting dogs 3 pounds  to 250 pounds. 
All models have flexible, snug-fitting frames, which have foam padding against the face; polycarbonate (shatterproof) and anti-fog lenses; and adjustable elastic head and
chin straps to keep the Doggles securely on the dog.
Doggles ILS feature patented wide nose bridge, deep lens cup, interchangeable lenses.
Dogs have a much wider nose bridge than humans, along with protruding eyes.  You need a goggle designed specifically to fit a dog's unique face structure.