Scroll down to see our dog collar measurement and size guide...

Penny Lou UK | Measuring Guide for Dog Collar
With a cloth measuring tape (like the ones you find in sewing kits) measure your dog’s neck circumference and then add two inches. This final measurement is the size of collar they need. The exception to this ‘two inch rule’ is if your dog is very small, where you should just add an inch, or very big, where you should add three inches. 
If your dog can slide the collar over their head it’s pointless and if it’s too tight it can cause great discomfort and even restrict breathing. Use your measurement as a starting point for finding a perfect fitting collar – when it’s fastened it should feel snug, but not tight. You should be able to fit two fingers under your dog’s collar. As with the measuring, if your dog is very small, it’s a single finger and if you have a very big dog, it’s three fingers. 
Regularly check your dog’s collar is in a good state of repair and that it still fits perfectly. It’s worth mentioning that some materials have give in them and can become bigger when exposed to lots of water, so in this case you’ll need to tighten. Just like us, dog’s weight can fluctuate, so it’s not uncommon to have to loosen or tighten a collar from time to time. 
If you are fitting a puppy that’s still growing for a collar, it’s a good idea to get an adjustable one that fits on the smaller end of the scale when you buy it. This way there’s plenty of room for their neck to grow, without changing collars. With a puppy, you should check their collar fits properly frequently, as their neck will continue to grow.
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You can also find our recommended sizes for each breed in the following chart. However, please note that these sizes are only based on estimations.
  
Since every pup still varies in size depending on age and whether they're male or female, remember to still check their neck girth. As long as you measure them, you should be good to go :)
  

Breed

Neck Girth

Weight

Size

Afghan

16-22 "

50-60 lbs

L

American Staffordshire Terrier

18-24 "

60-90 lbs

L

Alaskan Malamute

18-24 "

65-100 lbs

L

American Bulldog

18-24 "

60-120 lbs

L

American Eskimo

16-20 "

18-35 lbs

M/L

American Eskimo Mini

13-16 "

15-25 lbs

M

American Staffordshire Terrier

14-20 "

45-70 lbs

M

Australian Cattle Doge

22-28 "

31-35 lbs

XL

Australian Kelpie

15-21 "

25-45 lbs

L

Australian Shepherd

16-22 "

35-70 lbs

L

Australian Shepherd Mini

10-14 "

20-35 lbs

S

Basenji

10-14 "

20-26 lbs

S

Basset Hound

16-22 "

40-65 lbs

L

Beagle

12-18 "

18-30 lbs

M

Bedlington Terrier

14-18 "

17-23 lbs

M

Belgian Malinois

16-20 "

55-75 lbs

M/L

Bernese Mountain Dog

20-26 "

75-100 lbs

L/XL

Bichon Frise

10-16 "

10-14 lbs

S/M

Black And Tan Coonhound

19-23 "

70-85 lbs

L

Bloodhound

22-28 "

88-105 lbs

XL

Blue Heeler

18-24 "

65-100 lbs

L/XL

Border Collie

14-18 "

30-45 lbs

M

Border Terrier

11-14 "

11-16 lbs

M/L

Boston Terrier

12-18 "

10-25 lbs

M

Bouvier Des Flandres

22-26 "

60-77 lbs

XL

Boxer

16-22 "

55-75 lbs

L

Brittany

14-16 "

30-44 lbs

M

Bull Terrier

12-18 "

50-60 lbs

M

Bull Terrier Mini

14-18 "

18-28 lbs

M

Bullmastiff

26-28 "

100-130 lbs

N/A

Cairn Terrier

10-16 "

12-16 lbs

S/M

Cane Corso

22-30 "

90-110 lbs

XL

Caucasian Shepherd

22-26 "

100-200 lbs

XL

Cavalier King Charles Spaniel

10-14 "

13-18 lbs

S

Chihuahua

8-14 "

3-7 lbs

XS/S

Chinese Crested

8-11 "

5-10 lbs

XS

Chow

18-24 "

45-65 lbs

L

Cocker Spaniel

12-18 "

25-40 lbs

M

Collie

18-22 "

50-75 lbs

L

Corgi

14-16 "

25-38 lbs

M

Dachshund Mini

8-14 "

9-15 lbs

XS/S

Dachshund

16-20 "

16-32 lbs

M

Dalmatian

14-20 "

45-65 lbs

M

Doberman

16-22 "

65-100 lbs

L

Dogo Argentino

20-26 "

80-100 lbs

XL

Dogue De Bordeaux

20-26 "

120-140 lbs

XL

English Bulldog

18-24"

40-55 lbs

L

English Mastiff

28-38 "

120-250 lbs

N/A

English Setter

18-24 "

65-80 lbs

L

Fox Terrier

10-16 "

14-18 lbs

S/M

French Bulldog

12-18 "

18-28 lbs

M

German Shepherd

18-24 "

65-95 lbs

L

German Shorthair Pointer

20-26 "

45-70 lbs

L/XL

Golden Retriever

16-24 "

55-75 lbs

L

Goldendoodle Mini

12-16 "

30-45 lbs

M

Goldendoodle

16-22 "

40-50 lbs

L

Great Dane

20-26 "

125-135 lbs

L/XL

Great Pyrenees

24-30 "

90-125 lbs

XL

Greyhound

14-18 "

55-80 lbs

M

Havanese

8-14 "

7-13 lbs

XS/S

Irish Setter

16-22 "

53-70 lbs

L

Irish Terrier

16-20 "

25-27 lbs

M/L

Irish Wolfhound

20-27 "

115-120 lbs

L/XL

Italian Greyhound

8-11 "

7-12 lbs

XS

Jack Russell Terrier

10-14 "

9-15 lbs

S

Keeshond

18-24 "

30-40 lbs

M/L

King Charles Cavalier

10-14 "

13-18 lbs

S

Labradoodle Miniature

12-16 "

15-25 lbs

M

Labradoodle

14-20 "

50-65 lbs

M

Labrador

18-24 "

55-75 lbs

L

Lhasa Apso

12-16 "

13-18 lbs

M

Louisiana Catahoula Leopard

16-21 "

50-95 lbs

L

Lurcher

13-20 "

60-70 lbs

M

Maltese

10-14 "

6-9 lbs

XS/S

Maltipoo

8-14 "

5-20 lbs

XS/S

Newfoundland

26-32 "

110-150 lbs

N/A

Norwegian Elkhound

18-22 "

50-60 lbs

L

Old English Sheepdog

18-24 "

60-65 lbs

L

Papillon

8-12 "

8-11 lbs

XS

Pekingese

12-16 "

8-10 lbs

M

Pinscher Mini

8-11 "

8-12 lbs

XS

Pit Bull

14-20 "

40-70 lbs

M

Pomeranian

10-14 "

9-13 lbs

XS/S

Poodle Mini

10-16 "

12-20 lbs

S/M

Poodle Standard

12-18 "

45-70 lbs

M

Poodle Toy

8-14 "

12-17 lbs

XS/S

Portuguese Water Dog

15-20 "

35-60 lbs

M/L

Pug

12-16 "

14-18 lbs

M

Puggle

12-18 "

15-30 lbs

M

Rat Terrier

13-16 "

11-14 lbs

M

Rhodesian Ridgeback

20-23 "

60-90 lbs

L

Rottweiler

24-30 "

100-120 lbs

XL

Saluki

13-18 "

40-60 lbs

M

Schipperke

10-14 "

11-18 lbs

XS/S

Schnauzer Giant

20-26 "

70-80 lbs

L/XL

Schnauzer Mini

10-16 "

13-15 lbs

S/M

Schnauzer Standard

14-20 "

30-35 lbs

M

Scottish Terrier

19-23 "

19-23 lbs

L

Shar Pei

16-20 "

35-55 lbs

M/L

Shetland Sheep Dog (Sheltie)

11-18 "

15-27 lbs

M

Shiba Inu

14-17 "

17-23 lbs

M

Shichon

10-16 "

10-15 lbs

S/M

Shih Tzu

10-14 "

12-16 lbs

XS/S

Siberian Husky

16-22 "

40-60 lbs

L

Silky Terrier

10-14 "

8-10 lbs

XS/S

Springer Spaniel

14-18 "

49-55 lbs

M

St. Bernard

26-32 "

130-230 lbs

N/A

Swiss Shepherd

18-24 "

77-85 lbs

L/XL

Vizsla

15-22 "

40-65 lbs

M/L

Weimaraner

16-22 "

55-85 lbs

L

West Highland Terrier (Westie)

14-16 "

15-22 lbs

M

Wheaten Terrier

18-22 "

30-40 lbs

L

Whippet

13-15 "

30-35 lbs

M

Yorkshire Terrier (Yorkie)

6-12 "

6-9 lbs

XS