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

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

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

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

What size for a 45b Border Collie?

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

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

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

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🐾 Walk smarter, not harder — lead the pack with Halti Optifit!

LIGHTWEIGHT PADDED - Strong yet soft webbing with padded nose band for all-day comfort.
TAILORED COMFORT FIT - Adjustable nose band and cheek straps ensure a perfect fit for medium dogs.
STAY VISIBLE STAY SAFE - Reflective straps enhance low-light visibility for evening strolls.
SEAMLESS TRAINING PARTNER - Pairs perfectly with Halti double clip leash for ultimate no-pull control.
PULL FREE WALKS EVERY TIME - Gently steers your dog to stop leash pulling without discomfort.

The Company of Animals Halti Optifit Headcollar in Medium is a bestselling, adjustable dog head harness designed to stop pulling on the lead. Made from lightweight, padded webbing, it ensures comfort while allowing natural panting and drinking. Reflective cheek straps improve visibility during low-light walks, and a safety link attaches to your dog's collar for added security. Ideal for medium-sized dogs of all life stages, this humane and easy-to-use headcollar is the professional choice for effective no-pull training.

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Pet Type	Dogs
Product Dimensions	3 x 13.49 x 20.5 cm; 127.01 g
Item model number	12520A
Breed Recommendation	Medium
Pet Life Stage	All life stages
Allergen Information	Allergen-Free
Closure	Pull On
Color	Black/Red
Size	Medium (Pack of 1)
Volume	1 Milliliters
Number of Items	1
Quantity	1
Care instructions	Hand wash or delicate machine wash
Special Features	Adjustable Fit, Comfortable, Easy to Use, Safe
Specific Uses	Active
batteries required	No
Batteries Included	No
Item Weight	127 g

Company of Animals The HALTI Optifit Headcollar Size Medium, Bestselling Dog Head Harness to Stop Pulling on the Lead, Easy to Use, Adjustable & Reflective Head Collar for Dogs, Professional Anti-Pull

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