Size Guide
Our size guide helps you to choose the right style and size of Optivizor for your dog. Sizes are colour coded and grouped into three styles according to nose length - normal, long and short.
Normal Nose
Long Nose
Short Nose
Dogs come in all shapes and sizes. Some enjoy their food more than others. Some are energetic whereas others prefer to have a nap. These differences, plus breed, gender and age affect the size of Optivizor that is the best fit for your dog, so we recommend checking measurements first and then comparing below for specific breed recommendations.
Size and weight charts are based on measurements. Breed recommendations are based on customer feedback. Please contact us after purchase if you can help to update any listing.
Where possible we have included links to our Photo Gallery to help you make a visual comparison by breed. Remember our sizes are colour coded.
Where to Measure
Normal Nose Length / Long Nose Length - measure from the the tip of the dog’s nose to the mid-point of the back of the ears. Measure in a straight line and do not follow the contours of the dog’s face.
Short Nose Length - measure the head circumference around the dog’s head from the middle of the ears, down under the chin and back up to the ears.
Head Length
Mid Point of Ears
Circumference
Normal Nose Length
Head Length - measure from the the tip of the dog’s nose to the mid-point of the back of the ears. Measure in a straight line and do not follow the contours of the dog’s face.
Weight - check the current weight of your dog. Your vet will usually have a record of this. To weigh small dogs using bathroom scales you can carry them for a first measurement, put them down and measure your own weight, and then deduct one reading from the other. The calculations are easier if you use kilograms (convert stones to kg here).
Headrest - the minimum gap between ears. Please ignore this unless we ask you to check.
If head length and weight indicate different sizes please choose the smaller of the two.
Size
Head Length
Weight
Headrest
Dog breeds with a normal nose length:
Affenpinscher
Airedale Terrier / Medium ⬤ / see Sam
American Akita / Large ⬤ / see Zada
Alaskan Malamute / Large ⬤
American Collie
Appenzell Mountain Dog
Australian Shepherd
Basset Hound
Bearded Collie
Beaglier
Belgian Shepherd
Berger de Brie
Bernese Mountain Dog
St Bernard / Extra Large ⬤ / sometimes Large ⬤ / see Yogi and Spencer
Bloodhound
Border Collie / Small ⬤ / Small-Medium ⬤ / sometimes Medium ⬤ / see Jessie
Bichon Frise / Toy ⬤ / Small ⬤ / see Chipper and support section regarding fluffy heads
Bull Terrier
Cairn Terrier / Small ⬤
Chihuahua
Chow Chow
Cocker Spaniel / Small-Medium ⬤ / sometimes Small ⬤
Cumberland Sheepdog
Dachshund
Dalmatian
Dandie Dinmont Terrier
English Setter
Eskimo Dog
Foxhound
Fox Terrier
German Shepherd / Large ⬤ / sometimes Medium ⬤
German Longhaired Pointer
German Shorthaired Pointer / Medium ⬤ / see Oscar
Great Dane / Large ⬤ / Extra Large ⬤ / see Domino
Golden Retriever
Gordon Setter
Groenendael / Tervueren
German Hovawart
Hungarian Vizsla / Small-Medium ⬤ / sometimes Medium ⬤ / see Piri
Husky
Irish Setter
Irish Jack Russell Terrier / Toy ⬤ / see Lucy
Jack Russell Terrier / Toy ⬤ / see Spud and Bertie
Lakeland Terrier / Small ⬤ / see Jack
Lancashire Heeler (Ormskirk Terrier) / Toy ⬤
Lhasa Apso / Toy ⬤
Karabash
Komondor
Kuvasz
Labrador / Medium ⬤ / Large ⬤ / see Rufus, Zola and Max
Leonberger
Maltese
Mastiff
Mastino Napoletano
Miniature Pinscher
Miniature Poodle / Toy ⬤ / Small ⬤ / see Hugo
Miniature Schnauzer / Toy ⬤ / Small ⬤ / see Tasha and Storm
Munsterlander
Newfoundland (Newfie) / Extra Large ⬤ / sometimes Large ⬤
Old English Sheepdog
Parson Russell Terrier / Toy ⬤ / Small ⬤ / see Oscar
Pointer - see German Shorthaired/Longhaired Pointer
Poodle / Small-Medium ⬤ / Medium ⬤ / see Willis
Portuguese Water Dog
Rehpinscher
Rhodesian Ridgeback
Rottweiler
Schnauzer
Shetland Sheepdog
Springer Spaniel / Small-Medium ⬤ / Medium ⬤ / see Jester and Bailey
Spitz
Sprocker / Small-Medium ⬤ / Medium ⬤
Staffordshire Bull Terrier / Small ⬤ / Small-Medium ⬤ / sometimes Medium ⬤ / see Millie
Tibetan Terrier
Vizsla - see Hungarian Vizsla
Weimaraner
Welsh Corgie
Welsh Springer Spaniel
West Highland White Terrier (Westie) / Toy ⬤ / Small ⬤ / see George
Long Nose Length
Head Length - measure from the the tip of the dog’s nose to the mid-point of the back of the ears. Measure in a straight line and do not follow the contours of the dog’s face.
Weight - check the current weight of your dog. Your vet will usually have a record of this. To weigh small dogs using bathroom scales you can carry them for a first measurement, put them down and measure your own weight, and then deduct one reading from the other. The calculations are easier if you use kilograms (convert stones to kg here).
Headrest - the minimum gap between ears. Please ignore this unless we ask you to check.
Size
Head Length
Headrest
Dog breeds with a long or narrow nose:
Afghan Hound
Bedlington Terrier / Small ⬤ / see Gracie
Borzoi
Doberman Pinscher
Greyhound / Small-Medium ⬤ / see Dreamy
Irish Wolfhound / Medium ⬤
Lurcher / Small-Medium ⬤ / see Bob
Rough Collie
Saluki x Greyhound / Small-Medium ⬤
Scottish Deerhound / Small-Medium ⬤ / Medium ⬤
Sloughi
Spanish Galgo
Whippet / Small ⬤ / see Bry and Kiera
Short Nose Length
Circumference - measure the head circumference around the dog’s head from the middle of the ears, down under the chin and back up to the ears.
Headrest - the minimum gap between ears. Please ignore this unless we ask you to check.
Size
Circumference
Headrest
Dog breeds with a short nose or flat face:
Following extensive testing we have found the Optivizor is unlikely to provide a comfortable fit for French Bulldogs, Cavalier and King Charles Spaniels due to their characteristic head shape.
Bolognese
Boston Terrier / Toy ⬤ / Small ⬤ / Small-Medium ⬤
Boerboel / Extra Large ⬤
Boxer
Brussels Griffon / Mini Mini ⬤ / see Peggy
Bulldog / Small-Medium ⬤ / Medium ⬤ / see Marge and Barney
Bullmastiff
Cavalier King Charles Spaniel - Not recommended (see above)
Cavapoo (Mini Doodle)
Cairnoodle / Mini ⬤
Dogue de Bordeaux / Large ⬤ / see Diesel and Zinfandel
English Bulldog - see Bulldog
French Bulldog (Frenchie) - Not recommended (see above)
Havanese
Japanese Chin
Japanese Akita (Akita Inu) / Medium ⬤ / see Nunook
King Charles Spaniel - Not recommended (see above)
Papillon (Continental Toy Spaniel) / Tiny ⬤ / Mini Mini ⬤ / Mini ⬤ / see Quipp
Pug / Mini ⬤ / Toy ⬤ / Small ⬤ / see Pugly, Bertie, Toby, Annie and Kevin
Pekingese
Shar-Pei
Shih Tzu / Mini ⬤ / Toy ⬤ / see Dolly and Bailey
Tibet Spaniel
Yorkshire Terrier
