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

9-12 cm

<2 kg

43 mm

12-15 cm

2-6 kg

46 mm

16-18 cm

5-12 kg

50 mm

19-21 cm

10-25 kg

60 mm

22-24 cm

23-35 kg

68 mm

25-27 cm

33-45 kg

76 mm

28+ cm

46+ kg

84 mm

Dog breeds with a normal nose length:

Affenpinscher

Airedale Terrier / Medium / see Sam

American Akita / Large / see Zada

Alaskan Malamute

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

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

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

Poodle / Small-Medium / Medium / see Willis

Portuguese Water Dog

Rehpinscher

Rhodesian Ridgeback

Rottweiler

Samoyed / Medium / Large

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

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

12-15 cm

44 mm

15-17 cm

52 mm

17-20 cm

60 mm

20-23 cm

67 mm

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

28-30 cm

22 mm

30-32 cm

31 mm

32-34 cm

42 mm

35-38 cm

45 mm

39-43 cm

45 mm

44-48 cm

60 mm

49-55 cm

70 mm

56-60 cm

78 mm

60+ cm

83 mm

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)

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)

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