Finding the perfect GPS collar for your dog is only half the battle. The other crucial element is ensuring it fits properly, providing both security and comfort during your adventures together. A collar that's too tight can cause discomfort or even injury, whilst one that's too loose might slip off at the worst possible moment. Getting the sizing right from the start will save you headaches and ensure your furry companion stays safe and happy.
Understanding your dog's measurements and collar specifications
How to Properly Measure Your Dog's Neck for a GPS Collar
Before you even think about browsing through options, you need to take accurate measurements of your dog's neck. This isn't something you can eyeball or guess at. Grab a soft tape measure, the kind a tailor might use, and wrap it around the base of your dog's neck where the collar would naturally sit. This is usually just below the jawline, where the neck meets the shoulders. You want the tape to be snug enough that it won't slide around, but not so tight that you're squashing the fur or skin. A good rule of thumb is to ensure you can comfortably fit two fingers between the tape measure and your dog's neck. This gives you the baseline measurement you'll need to compare against manufacturer sizing charts. When shopping for GPS collars, many pet owners find options listed on various platforms, including the ofertaplus website, where detailed specifications can help guide your decision. Write down the measurement in both centimetres and inches, as different brands may use different units. If your dog has a particularly fluffy coat, consider measuring when the fur is at its typical state rather than freshly groomed or matted. The thickness of the coat can affect how the collar sits, so it's worth taking this into account.
Interpreting manufacturer sizing guides and weight considerations
Once you've got your measurement, the next step is to dive into the sizing guides provided by the manufacturers of GPS dog collars. Here's where things can get a bit tricky, because not all brands use the same sizing conventions. What one company calls a medium might be another's large, so don't rely solely on generic labels. Instead, look for the specific neck circumference ranges listed for each size option. If your dog's measurement falls right on the border between two sizes, it's generally safer to opt for the larger one. A collar that's slightly loose can be adjusted, but one that's too tight can cause serious discomfort or even restrict breathing. Weight is another factor that manufacturers often include in their guidelines, particularly for devices like the Tractive GPS and Health Tracker or the Garmin Alpha T20. Whilst the weight of the device itself might not seem significant, it can make a real difference for smaller breeds. A Jack Russell or a Dachshund might struggle with a bulky unit that's perfectly fine for a Labrador Retriever or a German Shepherd. Check the specifications carefully to ensure the collar unit isn't going to weigh down your pet unnecessarily. Some collars, such as the Apple AirTag with a separate collar attachment, offer a more lightweight solution for smaller dogs. Battery life and tracking range are important features, but they shouldn't come at the expense of your dog's comfort. The Fi Series 3, for instance, boasts an impressive ninety days of battery life, but you'll need to confirm that the physical collar component suits your dog's size and build. Similarly, the Whistle Go Explore and the Petcube GPS Tracker have their own sizing recommendations that should be followed closely to achieve the best fit.
Ensuring Proper Fit and Comfort for Your Dog's GPS Collar

Selecting adjustable collars and secure fastening systems
Adjustability is absolutely key when it comes to GPS collars, especially if you've got a puppy that's still growing or a dog whose neck size might fluctuate due to changes in weight or coat thickness. Look for collars that offer a decent range of adjustment, ideally with multiple holes or a sliding mechanism that allows for fine-tuning. This flexibility means you won't have to replace the collar every few months as your dog matures or if they gain or lose a bit of weight. The type of fastening system is equally important. Traditional buckles are reliable and secure, but they can sometimes be fiddly to adjust. Quick-release clips offer convenience, making it easier to get the collar on and off, but you'll want to ensure they're robust enough to withstand your dog's activity level. Some collars use a combination of both, providing the security of a buckle with the convenience of a clip. Whatever system you choose, it should be easy for you to operate but difficult for your dog to accidentally release. The Garmin Alpha T20, for example, is designed for hunting dogs and field trials, where a secure fit is non-negotiable. Similarly, the Tractive GPS and Whistle Switch Smart Collar are built to stay in place during vigorous activity, whether your dog is running through the woods or splashing in a stream. Consider the durability and weather resistance of the collar material as well. A good waterproof rating is essential if your dog loves to swim or if you frequently walk in wet conditions. The materials should be strong enough to withstand daily wear and tear without fraying or breaking. Real-time tracking features and geofencing alerts are fantastic, but they're only useful if the collar stays securely on your dog.
Testing the gps collar fit before outdoor use
Once you've selected a collar and received it, don't just slap it on your dog and head straight out for a ramble. Take the time to test the fit indoors first, in a controlled environment where you can observe how your dog reacts. Put the collar on and adjust it to what you think is the right snugness, then watch your dog's behaviour. Are they scratching at it excessively? Does it seem to be rubbing or causing irritation? Can they move their head and neck freely without the collar shifting around? Walk your dog around the house or garden for a few minutes and see how the collar sits during movement. Check again that you can still fit two fingers comfortably between the collar and your dog's neck. If the collar seems to be riding up towards the ears or sliding down towards the shoulders, you may need to adjust the fit or reconsider the size. Pay attention to the weight and placement of the GPS unit itself. Some designs position the tracker on the top of the neck, whilst others place it to the side. Make sure the unit isn't pressing uncomfortably against your dog's throat or interfering with their movement. If you notice any signs of discomfort, such as excessive scratching, reluctance to move, or changes in behaviour, take the collar off immediately and reassess. It's worth spending a bit of extra time on this initial fitting process to ensure your dog is comfortable and safe. Cellular tracking devices like the Petcube GPS Tracker and the Fi Series 3 rely on LTE-M networks, but that technology won't help you if the collar isn't properly fitted. Similarly, satellite tracking options like the Garmin Alpha T20 are brilliant for rural areas, but only if the collar stays securely on your dog. Subscription costs and battery life are important considerations, but they pale in comparison to the fundamental requirement of a well-fitting collar. Once you're confident that the collar is comfortable and secure, you can start using it for outdoor adventures, knowing that your dog is both safe and comfortable.