Doggles dog goggles are designed to protect dog's eyes from the sun's harmful rays, flying debris, wind, rocks, or bugs. Your dog can't tell you his eyes hurt, so be proactive and help your dog help its own eyes.
X-Small:Weight: 1-10 lbs (.5-5 kgs)Frame Size: 3.5" (8.9 cm)Head Strap: 5-13" (13-33 cm)Chin Strap: 3-7" (8-17 cm)Breed example: Chihuahua, Pomeranian, Yorkie
Small:Weight: 9-25 lbs (4-12 kgs)Frame Size: 4.75" (12.1 cm)Head Strap: 12-20" (30-50 cm)Chin Strap: 4-8" (10-20 cm)Breed example: Beagle, Westie, Jack Russell, Cavalier King Charles
Medium:Weight: 20-60 lbs (9-27 kgs)Frame Size: 5.5" (14 cm)Head Strap: 15-25" (38-63 cm)Chin Strap: 5-11" (13-28 cm)Breed example: Dalmation, Border Collie, Australian Shepherd
Large:Weight: 50-100 lbs (22-45 kg)Frame: 6.38" (16.2 cm)Head Strap: 18-30" (46-76 cm)Chin Strap: 7-16" (15-38 cm)Breed example: German Shepherd, Labrador Retriever, Boxer
X-Large:Weight: 100+ lbs (45+ kg)Frame: 7.25" (18.4 cm)Head Strap: 22-45" (56-114 cm)Chin Strap: 10-24" (28-66 cm)Breed example: St. Bernard, Newfoundland, Great Dane
The frame is the measurement from one corner of the frame to the other (outside corner of the eye to the outside corner of the eye across the face).
The longest strap measurement is length fully stretched.
Please keep in mind that breeds vary by size and that the breeds above are examples, you should go by the size and weight of your dog. The weight and frame measurements are the most important measurements. If you have any questions regarding size, please call customer service and they will be happy to assist you.