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.

The Optivizor is not recommended for a Cavalier King Charles Spaniel or French Bulldog due to the unique head shape characteristics of these breeds.

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

Akita / Large / see Zada

Alaskan Malamute

American Collie

Appenzell Mountain Dog

Australian Shepherd

Basset Hound

Bearded Collie

Beaglier

Bernese Mountain Dog

St Bernard / Extra Large / sometimes Large / see Yogi and Spencer

Bloodhound

Border Collie / Small / Small-Medium / sometimes Medium / see Jessie

Berger de Brie

Bichon Frise / Toy / Small / see 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

German Shepherd

Belgian Shepherd

German Shorthaired Pointer

German Longhaired Pointer

Great Dane / Large / Extra Large / see Domino

English Setter

Eskimo Dog

Foxhound

Fox Terrier

Golden Retriever

Gordon Setter

Groenendael / Tervueren

German Hovawart

Husky

Irish Setter

Jack Russell Terrier / Toy / see Spud and Bertie

Lakeland Terrier

Lancashire Heeler (Ormskirk Terrier) / 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

Munsterlander

Newfoundland (Newfie) / Extra Large / sometimes Large

Old English Sheepdog

Parson Russell Terrier

Pointer

Poodle

Portuguese Water Dog

Rehpinscher

Rhodesian Ridgeback

Rottweiler

Schnauzer

Shetland Sheepdog

Springer Spaniel / Small-Medium / Medium / see Jester

Spitz

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

Irish Wolfhound / Medium

Lurcher / Small-Medium / see Bob

Rough Collie

Saluki x Greyhound / Small-Medium

Scottish Deerhound / 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:

Bolognese

Boxer

Bulldog

Bullmastiff

Cavalier King Charles Spaniel / Not Recommended

Cavapoo (Mini Doodle)

Dogue de Bordeaux / Large / see Zinfandel

English Bulldog

French Bulldog / Not Recommended

Havanese

Japanese Chin

King Charles Spaniel / Not Recommended

Pug / Mini / Toy / Small / see Kevin

Pekingese

Shar-Pei

Shih Tzu / Toy / see Bailey

Tibet Spaniel

Yorkshire Terrier