Custom GPS Fencing for Bullmastiffs

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Living with a Bullmastiff brings its own unique set of challenges, particularly ensuring the safety of your high-spirited and fearless pet without hampering their innate sense of exploration.

The SpotOn Fence is a containment solution that acknowledges your Bullmastiff's specific needs, providing both security and the space your dog needs to explore.

Custom GPS Fencing Tailored to Your Bullmastiff

Bullmastiffs are a true testament to strength and loyalty. Recognized for their impressive size and muscular build, Bullmastiffs are one of the larger breeds, which requires a secure and spacious containment solution. Despite their size, they're not overly active dogs, though they do need space to move around. Their temperament leans more on the mellow side; however, they are also well-known for their protective instincts and might wander off beyond if they sense a potential threat or intruder.

With SpotOn's precision GPS fencing, you can provide your Bullmastiff with the room they need to roam safely. There's no need for physical fences that your large and powerful breed might easily overcome. Whether at home or on the go, SpotOn's solution keeps your Bullmastiff within specified virtual boundaries while giving them the freedom to explore.
geofence dog collar with SpotOn app
gps dog collar
wireless dog fence collar
geofence dog collar
dog wearing wireless dog fence collar
gps dog fence system in action on Finn, 40 pound brown dog
wireless dog collar worn by Myla, 90 pound golden retriever

No boundary too big.

The GPS Dog Fence that's as accurate and flexible as your dog is curious.

geofence dog collar with SpotOn app
gps dog collar
wireless dog fence collar
geofence dog collar
dog wearing wireless dog fence collar
gps dog fence system in action on Finn, 40 pound brown dog
wireless dog collar worn by Myla, 90 pound golden retriever

  • Sets up in Minutes - Any Size/Shape

    Create fences from ½ acre to 1K+ acres at home, on the go, or if you move.

  • Most accurate GPS Boundaries

    SpotOn’s patented True Location™ technology taps into a network of 128 satellites to provide boundary accuracy comparable to a buried wire fence.

    SpotOn is 7x more accurate than the other GPS smart fence. Head-to-head testing by an independent lab revealed SpotOn is the most precise and reliable solution. See the results.

  • Works Anywhere - Even Remote Areas

    SpotOn uses GPS to contain your dog. It works anywhere on the planet - even in remote areas without a subscription. Add a cell subscription to unlock additional features.

  • Details & Specs

      SpotOn includes a GPS network connection that allows you to create, save, and use unlimted GPS fences. Also included in the box:

    • 1 SpotOn collar
    • 2 sets of static contact points
    • Static contact point tester/insertion tool
    • Charging base and wall charger
    • User guide

    Package Dimensions: 8in x 7.13 in x 4.19 in
    Package Weight: 1lb, 14.7 oz
    Size Small fits a neck size of 10” - 14”
    Size Medium fits a neck size of 12” - 18”
    Size Large fits a neck size of 17" - 26”
    Battery Type: Rechargeable high capacity lithium-ion battery
    Battery Life: up to 22 hours containment, 14 hours tracking
    Time to full charge: 1 hour
    Sim Card: Verizon or AT&T LTE-M
    GPS: High-sensitivity GPS/GLONASS/Galileo/Beidou receiver

Spring Sale
$999.00
$899.00 (save $100)

  • Free US Shipping
  • 1 Year Warranty
  • 90-day no-hassle returns
  • Ships in 2 business days

$899.00 USD

Size Guide

Collar Size Guide:

Selecting the right size is important! It ensures your collar’s antenna will face the sky and receive the strongest GPS signal, making the entire system more accurate.

1. Measure your dog’s neck just above their regular collar.

2. Make sure you can fit two fingers under the measuring tape.

3. Select correct size.

Small 10” - 14” Medium 12” - 18” Large 17” - 26”
- +

Keep Your Bullmastiff Active With Reliable Containment

Bullmastiffs, although known for their strength and protectiveness, are inherently calm and content with a moderate approach to exercise. However, regular physical activity is essential to ensure the breed stays away from obesity and the undesirable behaviors connected to boredom. Giving your pup some daily free play in your yard will keep your bullmastiff mentally stimulated and physically fit.

With SpotOn Fence's precision GPS fencing, you can create a virtual play zone that gives your bullmastiff the freedom to move about and play, without you worrying about them wandering off or entering restricted areas. The customized fence works in dense tree cover and rough terrain, and can cover huge expanses regardless of the size of your property. And even better, you'll get real-time alerts should your bullmastiff decide to take an unscheduled adventure outside the fence. You get the satisfaction of keeping your dog active and under check without the need of a physical border.

Training Your Mastiff to the SpotOn Fence

Training a Mastiff can pose unique challenges. These massive, intelligent dogs are naturally protective, and their physical strength coupled with a stubborn streak can make implementing conventional boundary training methods an uphill task. SpotOn Fence is here to revolutionize that experience by providing a state-of-the-art, intuitive platform that allows you to establish firm boundaries effectively.

Every SpotOn Fence comes with training modules specially designed to cater to strong-willed breeds like the Bullmastiff. Encountering obstacles on your training journey? We offer a complimentary 1:1 consult with a qualified dog trainer to help you get back on track. This ensures your Bullmastiff comprehends and respects the SpotOn Fence boundaries and has a positive engagement with the training process.

  • Fences work without subscription

    Optional subscription gives real-time GPS dog collar tracking notifications if your dog leaves the virtual fence & lets you use the app to call them home.

  • Works in remote areas

    True Location™ GPS technology - the most advanced in GPS dog fences- provides precision accuracy, even in the woods & areas with no internet access.

  • Most accurate & reliable

    SpotOn’s active dual-feed antenna taps into a network of 128 satellites - allowing you to create precise boundaries.

  • Can Be Worn Indoors

    Only SpotOn lets you set a GPS perimeter around your home to disable feedback and eliminate false warnings or corrections indoors.

  • Quick-charge battery

    Stay out all day and recharge in about an hour with included power adaptor (lasts 25 hours per charge).

  • Waterproof

    Let your dog swim, splash & play in the rain - our GPS dog collar has an IP67 rating.

  • Proven Containment Method

    Keeps dogs contained with two alert tones and (optional) static correction or vibration + SpotOn never corrects a dog returning to the fence.

  • Designed & assembled in the usa

    We proudly design, develop & manufacture in New Hampshire.

SpotOn: The Best GPS Fence for Mastiffs

Learn how the SpotOn Fence can transform your Bullmastiff's outdoor exploration while maintaining their safety.

Experience peace of mind that they're securely contained within the trackable, tailor-made boundaries of the world's most advanced GPS fencing solution.

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SpotOn GPS Dog Fence™
Stephanie S.

With 7 acres of land, it was nearly impossible for us to contain our dogs.

SpotOn GPS Dog Fence™
Leo M.

We live on a 10 acre ranch and she has 9 acres to run around on. I never have to worry about her even though we live along side a major highway.

SpotOn GPS Dog Fence™
Heather H.

I love how I can keep my dogs off the busy road we live on without a fence.