GPS dog collars: why accuracy varies so much depending on where you walk your dog
Published by Planète Pets · managing editor: Clément Lacaille · how our guides are written
A GPS collar that places your dog 30 metres from its actual position deep in the woods is not necessarily faulty: the environment is often what's scrambling the signal. A New Zealand study published in 2013 in PLOS ONE set out to find exactly which factors make that accuracy vary (see the study). Our other guidance is gathered in the dog travel and safety section.
Clear sky, vegetation, buildings: which factor matters most
Amy Adams, Katharine Dickinson, Bruce Robertson and Yolanda van Heezik tested lightweight GPS collars in a suburban environment, varying sky availability (obstruction from canopy or structures), vegetation complexity, proximity to buildings, and visible satellite geometry. The result: sky availability comes out as the factor with the largest effect on successful fix rate, ahead of vegetation and building proximity, which mainly influence how large the location error is once a fix is obtained.
What this study does not show
The study covers GPS collars built for wildlife research in 2013, not necessarily today's consumer models, whose chips and correction algorithms have moved on since. The setting tested is suburban New Zealand: dense forest or a downtown area with many tall buildings could amplify the effects measured here even further. The study does not test battery life or the reliability of the cellular or LoRa transmission consumer collars use to relay a dog's position.
What it changes when choosing and using a GPS collar
- Dense forest or heavy sky obstruction from buildings reduce a GPS collar's accuracy, worth keeping in mind for a dog that wanders into woodland rather than open fields — see our comparison of GPS dog collars.
- A shorter fix interval (position updated every few seconds rather than every few minutes) limits the impact of a brief signal loss, at the cost of shorter battery life.
- A GPS collar remains a complement to mandatory identification, not a substitute for it: a microchip allows identification if a dog is lost, while a GPS collar helps locate the dog before anyone else finds it.
- In an area known for signal dead zones (a steep valley, dense forest), a tracking line remains a useful backup until GPS coverage is reliable again.
Frequently asked questions
Can a GPS collar lose signal without warning?
Yes: this study shows sky availability can drop sharply under dense woodland cover, which can explain a frozen position or a temporary location error without the unit itself being faulty.
Do newer models fix this problem?
GPS chips and correction algorithms have improved since 2013, but the underlying physical factor — an obstructed sky limits how many satellites can be picked up — still applies regardless of the hardware generation.
Should I avoid forest walks with a GPS collar?
No, but it's best not to rely solely on metre-level accuracy in that kind of terrain, and to favour a leash or a long line until recall is 100% reliable. Find all our guides on the dog hub.
This guide is part of Planète Pets’s Dogs universe. Our advice is general in nature: for any health concern, your veterinarian remains the only reference.