Collar size and fit for my dog
A collar is more than just a fashion accessory for your canine companion; it's an essential tool for their safety, comfort, and training. However, its effectiveness and safety depend entirely on two fundamental factors: its size and its fit . An improperly chosen or adjusted collar can have negative consequences on your dog's physical health and behavior. This article explores in depth why collar size and fit are non-negotiable elements in ensuring your pet's well-being.
Why is the Right Necklace Size Important?
Choosing the right collar size is the first step in ensuring your dog's comfort and safety. An ill-fitting collar can cause a range of problems, from minor discomfort to serious injury.
Physical Injury Prevention
A collar that's too small can put excessive pressure on your dog's windpipe, making breathing difficult and causing coughing, choking, and even permanent throat and thyroid damage. Dogs that pull on their leash with a collar that's too tight are particularly at risk. Similarly, constant friction from an improper fit can lead to skin irritation, redness, sores, and even hair loss around the neck.
Conversely, a collar that is too large poses an escape risk. A dog can easily wriggle free of a loose collar, especially if frightened or reactive, which can put them in danger in traffic situations or cause them to get lost. A collar that is too loose can also slip down the dog's front legs, immobilizing or injuring them.
Comfort and Freedom of Movement
A properly fitted collar allows your dog to breathe, drink, eat, and move freely without any discomfort. Comfort is essential so your dog associates wearing the collar with a positive experience, making walks and training sessions easier. A dog that is uncomfortable with its collar may become anxious, refuse to walk on a leash, or develop unwanted behaviors.
How to Correctly Measure Your Dog's Neck?
Accurately measuring your dog's neck is key to choosing the right size collar. Here are the steps to follow:
- Use a flexible tape measure : Avoid rigid tape measures that do not adapt well to the shape of your dog's neck.
- Measure the widest part of the neck : Place the tape measure around the base of your dog's neck, just behind the ears and where the collar will naturally sit. Make sure the tape measure is neither too tight nor too loose.
- **Apply the two-finger rule**: Once you've measured, add about 2 to 3 centimeters (or the equivalent of two fingers) to that measurement. This will ensure a comfortable fit that won't choke your dog while also preventing them from easily slipping out of the collar.
Indicative table of collar sizes by breed (as an example):
Dog Breed |
Average Neck Circumference (cm) |
Recommended Necklace Size |
Chihuahua |
18-25 |
XS |
Yorkshire Terrier |
20-30 |
XS-S |
Beagle |
30-40 |
SM |
Australian Shepherd |
40-55 |
ML |
Labrador Retriever |
45-60 |
L-XL |
German shepherd |
50-65 |
L-XL |
Great Dane |
60-75 |
XL-XXL |
Note: This table is for guidance only. Individually measuring your dog's neck is always the most reliable method.
The Perfect Fit: The Two-Finger Rule
Once you've chosen the right size collar, fit is just as crucial. The two-finger rule is the simplest and most effective way to check if your dog's collar fits properly.

How to Apply the Two Finger Rule?
After putting the collar on your dog, try sliding two fingers (flat) between the collar and his neck. If your fingers fit comfortably without forcing, the collar is snug. If they don't fit, the collar is too tight and needs to be loosened. If you can slide more than two fingers in, the collar is too loose and needs to be tightened.
The Consequences of a Bad Adjustment
A collar that is too tight can cause:
● Breathing difficulties : Pressure on the trachea, coughing, excessive panting.
● Skin irritations : Chafing, redness, sores, hair loss, infections.
● Pain and discomfort : The dog may scratch, rub its neck, or show signs of distress.
● Behavioral problems : Anxiety, aggression, refusal to walk on a leash.
A collar that is too loose can lead to:
● Risk of escape : The dog can easily remove its collar and escape.
● Injuries : The collar can get caught on objects, or the dog can put a paw through it and injure itself.
● Loss of Identification : If the collar falls off, the identification tag is lost, making it more difficult to find your dog if it gets lost.
● Insufficient control : You will have less control over your dog during walks, increasing the risk of accidents.
When to Check and Readjust the Collar?
Adjusting the collar is not a one-time action. It is important to check it regularly:
● For puppies : Puppies grow quickly. Check the fit of the collar at least once a week and adjust it if necessary. It is often recommended to purchase adjustable collars for puppies.
● For adult dogs : Check the fit of the collar regularly, especially after swimming (wet fur can make the collar tighter) or if your dog has gained or lost weight.
● After purchasing a new collar : Always check the fit before first use.
Conclusion

Collar sizing and fit are fundamental aspects of responsible dog ownership. A well-chosen and properly fitted collar ensures your companion's safety, comfort, and well-being, while also facilitating training and strengthening your bond. Take the time to accurately measure your dog's neck and apply the two-finger rule. It's a small gesture that makes a big difference to your pet's health and happiness.