Dog Collar Types and Sizing Guide for North York and Toronto 2026: Flat, Martingale and Safety Breakaway

Choosing the right dog collar is one of the most important decisions a pet owner can make for their dog's comfort, safety, and daily life. The wrong collar can cause neck injuries, allow escapes, or simply irritate your dog on every walk. At Ashario Pets, our North York store on Finch Ave W receives dozens of questions every week from Toronto-area dog owners confused by the sheer variety of collar styles, widths, and sizing systems. This guide breaks it all down clearly — so you can shop with confidence, whether you're visiting us in person or browsing our dog accessories online.

As of 2026, the three collar types that dominate our accessory floor are flat collars, martingale collars, and safety breakaway collars. Each serves a distinct purpose, fits different dogs differently, and pairs with different walking and training styles. We'll walk through each one, explain how to measure your dog for a correct fit, and help you identify which style belongs on your dog's neck starting today.

Key Takeaway: The right dog collar depends on your dog's breed, neck shape, temperament, and how you use it — for ID tags only, for leash walking, or for training. A properly fitted collar should allow two fingers to slide beneath it, no more and no less.

What Are the Main Dog Collar Types Available in Canada in 2026?

The three primary dog collar types sold in Canadian pet stores in 2026 are flat collars, martingale collars, and safety breakaway collars. Flat collars are the everyday standard. Martingale collars are a limited-slip design favoured for dogs with narrow heads. Safety breakaway collars are designed to release under pressure, reducing the risk of strangulation when a dog plays unsupervised.

There are also specialty options — head collars, prong collars, e-collars — but these fall outside the scope of this guide and should only be used under the direct guidance of a certified trainer or veterinary behaviourist. For general walking, ID-tag carrying, and supervised outdoor time, the three types above cover the needs of the vast majority of dogs in the Toronto and North York area.

Flat Dog Collars

Flat collars are the most common dog collar type, consisting of a strip of nylon, leather, or fabric secured with a buckle or quick-release clasp. They sit flat against the neck, hold ID tags, and attach to a standard leash. Most adult dogs wear a flat collar every day of their lives.

Flat collars are available in widths from 1.3 cm (0.5 inches) for small breeds and puppies up to 5 cm (2 inches) for large and giant breeds. Width matters: a collar too narrow for a large-breed dog concentrates pressure on a small area of the neck, while an oversized collar on a small dog is heavy and awkward. As a general rule, dogs under 10 lbs do best with a 1.3–2 cm wide collar; dogs 10–50 lbs typically need a 2–2.5 cm collar; dogs over 50 lbs benefit from a 2.5–5 cm collar.

Buckle material is also important. Plastic quick-release buckles are lightweight and easy to use but can fail under extreme pulling force. Metal centre-bar buckles are more durable and suited for strong dogs or dogs used in working situations.

Martingale Collars

A martingale collar — sometimes called a limited-slip collar or Greyhound collar — tightens slightly when the dog pulls backward, preventing the collar from slipping over the head without applying the constant pressure of a choke chain. When properly fitted, a martingale tightens only to the dog's neck circumference, never beyond, making it a safe and humane option for sighthounds, whippets, and any dog with a head narrower than their neck.

In our North York store, we see a lot of customers from the Yonge-Finch area coming in specifically for martingale collars after their Greyhound, Whippet, or Saluki slipped out of a standard flat collar during a walk. The martingale's design was literally invented to solve this problem. Beyond sighthounds, martingales are also popular with trainers for breeds that tend to back out of collars — Beagles, Basset Hounds, and Shiba Inus among them.

Martingale collars should be sized so the collar, when fully tightened, matches the dog's neck circumference — typically 33–36 cm for small breeds, 36–46 cm for medium breeds, and 46–60 cm for large breeds. They are designed for leash walking only and should be removed when the dog is unsupervised, as the tightening loop can catch on objects.

Safety Breakaway Dog Collars

Safety breakaway collars use a clasp engineered to release under a set amount of lateral pressure — typically around 5–10 lbs of force — so that if a dog's collar snags on a fence, crate bar, or another dog's mouth during play, the collar releases before the dog is injured. For households with multiple dogs, or dogs who spend time in crates or yards unsupervised, breakaway collars meaningfully reduce the risk of accidental strangulation.

The American Veterinary Medical Association (AVMA) has documented cases of collar-related injuries and fatalities in multi-dog households, reinforcing the importance of using breakaway-style collars in any situation where a dog might be left unattended while still wearing a collar. Many veterinarians and shelter workers now recommend breakaway collars as the default for dogs under three years of age, as young dogs are particularly prone to collar-catching accidents during rough play.

Breakaway collars retain a secondary leash loop that bypasses the breakaway mechanism, so you can still attach a leash without the collar releasing every time your dog pulls. Always ensure ID tags are affixed to the collar before letting your dog out.

How to Measure Your Dog for the Right Collar Size

To size a dog collar correctly, measure the circumference of your dog's neck at its widest point using a soft fabric measuring tape, then add 2.5–5 cm (1–2 inches) to determine the ideal collar size. The finished collar should allow exactly two adult fingers to slide comfortably beneath it — snug enough that the collar cannot slip over the head, loose enough that it doesn't restrict breathing or cause skin irritation.

Here is a practical size chart based on neck measurements, expressed as bullet points for easy reference:

• Extra Small (XS) — Neck circumference 20–28 cm (8–11 inches) — suited to Chihuahuas, Toy Poodles, Yorkshire Terriers
• Small (S) — Neck circumference 28–38 cm (11–15 inches) — suited to Beagles, Cavalier King Charles Spaniels, Shih Tzus
• Medium (M) — Neck circumference 38–50 cm (15–20 inches) — suited to Border Collies, Cocker Spaniels, Whippets
• Large (L) — Neck circumference 50–60 cm (20–24 inches) — suited to Labrador Retrievers, Golden Retrievers, Siberian Huskies
• Extra Large (XL) — Neck circumference 60–76 cm (24–30 inches) — suited to Great Danes, Bernese Mountain Dogs, Saint Bernards

Our team at Ashario Pets recommends measuring your dog's neck fresh before every purchase — especially for puppies whose neck circumference can change by 3–5 cm in a single month. For martingale collars, measure the widest part of the skull as well, since the collar must be able to slip over the head when loose.

Never rely on breed-average sizes alone. Two Labrador Retrievers can have neck circumferences that differ by 8 cm or more. Always measure the individual dog.

Collar Sizing by Breed Type: A Practical Reference

Breed morphology significantly affects which collar type and size is appropriate. Dogs with brachycephalic (flat-faced) anatomy — Bulldogs, Pugs, French Bulldogs — are better served by harnesses for walking, with a lightweight flat collar worn only for ID tags, as their compressed airways make any neck pressure a health concern. The American Kennel Club (AKC) advises that brachycephalic breeds should use body harnesses as their primary walking restraint.

• Sighthounds (Greyhound, Whippet, Saluki) — Martingale collar sized to neck circumference when tightened; never a standard flat collar alone
• Large strong-pulling breeds (Rottweiler, German Shepherd, Husky) — Wide flat collar (3.8–5 cm) with a metal buckle; pair with a no-pull harness for leash walking
• Brachycephalic breeds (Pug, Bulldog, French Bulldog) — Lightweight flat collar for ID tags only; always walk on a harness
• Small terriers (Jack Russell, Yorkshire Terrier) — Narrow flat collar (1.3–2 cm) with quick-release buckle; breakaway style recommended for unsupervised time
• Puppies under 6 months — Lightweight breakaway collar sized and checked weekly; upgrade size monthly as the puppy grows

Pet owners tell us that the single most common sizing mistake they make is purchasing a collar based on the breed description on the packaging rather than measuring their individual dog. Every dog is different. A male and female of the same breed can differ by 10+ cm in neck circumference.

Collar Materials: Nylon, Leather, Biothane and Fabric

Collar material affects durability, comfort, water resistance, and ease of cleaning — all practical concerns for Toronto dog owners navigating everything from summer humidity to winter slush on the Finch Ave sidewalks near our store.

• Nylon — Lightweight, affordable, machine-washable, available in nearly every width and colour. Ideal for everyday use. Can irritate sensitive skin if wet frequently.
• Leather — Durable, softens with wear, natural material. Requires conditioning to prevent cracking. Not ideal for dogs who swim regularly.
• Biothane — A coated webbing material that is fully waterproof, odour-resistant, and wipes clean. Growing rapidly in popularity among active dog owners in the GTA.
• Fabric/Woven — Comfortable for sensitive skin, stylish patterns available. Check stitching quality; inexpensive fabric collars can degrade quickly with outdoor use.

Explore our full range of dog supplies in North York, including collars, leashes, and harnesses designed for Canadian weather conditions.

Dog Collar Safety Tips Every Toronto Pet Owner Should Know

A correctly fitted and appropriate collar dramatically reduces the risk of injury, escape, and entanglement. The following safety guidelines reflect current best practices as of 2026:

• Check collar fit every two weeks for puppies, monthly for adult dogs. Weight gain of just 2–3 kg can make a previously correct collar dangerously tight.
• Remove collars when dogs are crated overnight or left unsupervised. If a collar must remain on, use a breakaway style.
• Inspect the collar's hardware monthly — check for rust, bent buckle prongs, and fraying stitching at the D-ring attachment point.
• Rotate between two collars in wet climates so one can dry fully between uses; a consistently damp collar harbours bacteria and can cause skin irritation.
• Never attach a retractable leash to a collar. Use a harness with retractable leashes to distribute the sudden jerk force across the chest rather than the neck.
• ID tags should be riveted or secured with a split ring rated for the dog's weight; flimsy split rings open under stress and ID tags are lost precisely when they're most needed.

For more information on responsible dog ownership in Ontario, the Canadian Veterinary Medical Association (CVMA) publishes updated guidelines on pet safety equipment and identification requirements.

If you're shopping for leashes and harnesses to complement your new collar, explore our full dog accessories collection at Ashario Pets — available in-store in North York or delivered across the GTA via Uber Eats, DoorDash, or SkipTheDishes.

Frequently Asked Questions: Dog Collar Types and Sizing in Toronto 2026

What is the best dog collar type for a dog that slips out of its collar in Toronto parks?

A martingale collar is the best solution for dogs that slip out of standard flat collars. The limited-slip design tightens to the dog's neck circumference when backward pressure is applied, making escape nearly impossible without applying choking pressure. Properly fit a martingale so the collar, when fully tightened, sits snugly at the neck — approximately equal to the dog's measured neck circumference in centimetres. This is the collar of choice for sighthound breeds and any dog with a head that is narrower than their neck.

How do I measure my dog's neck for a collar in Ontario?

Use a soft fabric measuring tape to measure the circumference of your dog's neck at its widest point, then add 2.5 cm (1 inch) for small dogs and 5 cm (2 inches) for large dogs to get the target collar length. When the collar is fastened, you should be able to slide exactly two adult fingers beneath it — not one finger, not three. Measure fresh before every collar purchase, particularly for growing puppies whose neck circumference can increase by 3–5 cm per month.

Are breakaway collars safe to use with a leash in North York?

Yes — most safety breakaway collars include a secondary D-ring that bypasses the breakaway mechanism, allowing safe leash attachment. When you clip your leash to this dedicated ring, the collar will not release during normal pulling or leash pressure. The breakaway clasp only activates under strong lateral or snagging force — typically 5–10 lbs — which is not generated by standard leash walking. Always check that the collar you purchase has a dedicated leash attachment point separate from the breakaway clasp.

What collar width is right for my dog's size?

Dogs under 10 lbs should wear collars 1.3–2 cm wide. Dogs weighing 10–50 lbs do well with a 2–2.5 cm wide collar. Dogs over 50 lbs benefit from collars 2.5–5 cm wide, as greater width distributes pressure across more surface area and reduces the risk of neck strain. For giant breeds like Great Danes or Mastiffs, a 5 cm wide collar with a metal centre-bar buckle provides the best combination of security and comfort. Collar width should scale proportionally with both the dog's weight and the strength of their pulling behaviour.

Where can I buy a martingale or breakaway dog collar in North York?

Ashario Pets carries a range of dog collars — including martingale styles and safety breakaway options — at our North York location at 1111A Finch Ave W, Unit 2, North York, ON M3J 2P7. We are open 7 AM to 11 PM daily, 365 days a year, including all holidays. You can also reach us at +1-647-564-4433. GTA-wide delivery is available through Uber Eats, DoorDash, SkipTheDishes, Instacart, and Fantuan. Shop dog accessories online at Ashario Pets or visit us in store for a fitting.