Question 1

How are these sized?  I see no information on how to order the correct size but I may have missed it.

Accepted Answer

Small: Westie, Jack Russell, Yorkie, Border Terrier Medium: Cattledog, Springer Spaniel, Border Collie, Labrador, German Shepherd, Boxer, Doberman, RetrieversLarge: Rottweiler, Great Dane, Newfoundland, Large German Shepherd How to Measure: Using a flexible measuring tape 1) measure the circumference of the thickest part of the dog's snout, which is closest to the base of the head; 2) measure the circumference of the dog's neck starting at the point directly behind his jaw.SmallSnout: 5" retracted to 12" extendedNeck: 6" retracted to 12" extendedExamples: Westie, Jack Russell, Yorkie, Border TerrierMediumSnout: 8" retracted to 15" extendedNeck: 6" retracted to 17" extendedExamples: Labrador, German Shepard, Boxer, Doberman, RetrieverLargeSnout: 10.5" retracted to 17.5" extended Neck: 6" retracted to 24" extendedExamples: Rottweiler, Great Dane, Newfoundland, Large German Shepard

Question 2

I have an 80 lb English lab. What size will best fit him for the halti opti fit?

Accepted Answer

I would agree that a Medium should fit your dog.  They seem to be generously sized and adjustable.  Works wonderfully on our young German Shepard mix rescue.  He is a large, strong puller and it has made exercising him on leash a pleasure.  It is unfortunate that sizing information is not included here.  I am certain a medium is your size but here is Halti Sizing:SmallSnout: 5" retracted to 12" extendedNeck: 6" retracted to 12" extendedExamples: Westie, Jack Russell, Yorkie, Border TerrierMediumSnout: 8" retracted to 15" extendedNeck: 6" retracted to 17" extendedExamples: Labrador, German Shepard, Boxer, Doberman, RetrieverLargeSnout: 10.5" retracted to 17.5" extended Neck: 6" retracted to 14" extendedExamples: Rottweiler, Great Dane, Newfoundland, Large German Shepard

Question 3

What size for a 45b Border Collie?

Accepted Answer

This is the sizing guide provided by the manufacturer of the Opti Fit Head Collar  Sizing:Small: Westie, Jack Russell, Yorkie, Border Terrier  Medium: Cattledog, Springer Spaniel, Border Collie, Labrador, German Shepherd, Boxer, Doberman, Retrievers Large: Rottweiler, Great Dane, Newfoundland, Large German Shepherd

Question 4

how adjustable is the collar is there growing room or not really

Accepted Answer

There is growing room both straps that you can see in the picture are fully adjustable.

ASIN	B00EQ3423I
ASIN	B00EQ3423I
Age Range Description	All Life Stages
Animal Collar Type	Animal Headcollar
Best Sellers Rank	#21,134 in Pet Supplies ( See Top 100 in Pet Supplies ) #7 in Headcollars
Brand Name	Halti
Breed Recommendation	Medium Breeds
Closure Type	Pull On
Color	Black/Red
Customer Reviews	4.1 4.1 out of 5 stars (11,382)
Date First Available	August 15, 2013
Dog Breed Size	Medium
Global Trade Identification Number	00886284125208
Included Components	1 Halti Optifit Headcollar
Item Dimensions L x W	8.07"L x 1.18"W
Item Display Dimensions	7.87 x 4.92 x 1.18 inches
Item Type Name	Optifit Dog Headcollar
Item Weight	4.48 ounces
Item model number	12520F
Manufacturer	Company of Animals
Manufacturer	Company of Animals
Manufacturer Part Number	12520F
Material Type	Nylon
Model Number	12520F
Number of Items	1
Pattern	Solid
Pet Type	Dog
Product Care Instructions	Hand wash or delicate machine wash
Product Dimensions	1.18 x 5.31 x 8.07 inches; 4.48 ounces
Product Style	HALTI OptiFit Headcollar, Medium
Size	Medium
Target Species	Dog
UPC	886284125307 886284125208
Unit Count	1 Count
Warranty Description	Manufacturer Warranty

Optifit Headcollar Size Medium, Dog Head Harness to Stop Pulling on the Lead, Easy to Use, Adjustable & Reflective Head Collar for Dogs, Professional Anti-Pull Training Aid, Black

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