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GPS F850 Check price on Amazon

GPS Wireless Dog Fence, Electric Dog Collar Fence & Perimeter Containment System, IPX7 Waterproof Collar, 25-999 Yards Radius, Beep Vibration Shock Correction, for Dogs Over 18 lbs Review

By Dr. Lena Ortiz · Canine wellness writer · Published 2026-06-19 · Updated 2026-06-28

4.4 (40) Amazon rating$109.99200+ bought last month

Our verdict

The F850 covers an unusually wide 25 to 999 yard radius with three correction levels, and its 4.4 star average from 40 reviews gives it more of a track record than most of the fences in this category.

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Best for

Owners of large, extra-large, or giant dogs over 18 pounds who need a wide, adjustable boundary on a big yard or rural property.

Skip if

You have a small dog under 18 pounds or only need a tight boundary, since this system is built and sized for bigger dogs and bigger spaces.

  • Breed size Giant, Large
  • Priced 83% above the category median ($59.99 across 100 tracked models)

Our scorecard

4.2/5 overall
  • Owner rating4.4/5

    4.4 average across 40 owner ratings

  • Popularity1.2/5

    40 owner reviews, fewer than most models here

The overall score is owner satisfaction weighted by how many reviews back it, so a high rating from few reviews counts for less. The bars below show where this model stands against the other dog and cat food, health, gear and grooming we track in this category on price, popularity and size. Context, not marks against it, and our read of the data, not a lab test.

Overview

The F850 is a perimeter containment system built around a 27 inch collar that adjusts its boundary anywhere from 25 to 999 yards, which is a wider range than most competing wireless fences offer. Correction runs through three levels, beep, vibration, and shock, so you can start mild and only escalate if your dog ignores the warning tones.

The collar carries an IPX7 waterproof rating and is backed by a 1 year manufacturer warranty. It is recommended for large, extra-large, and giant breeds rather than smaller dogs, and at $109.99 it sits in the middle of the pricing range for this type of system.

Pros

  • Adjustable radius from 25 to 999 yards covers everything from a modest yard to a large rural property
  • Three correction levels, beep, vibration, and shock, let you dial in the mildest effective setting
  • IPX7 waterproof collar holds up to weather and outdoor play
  • 1 year warranty backs the unit
  • 40 reviews averaging 4.4 stars gives a reasonable amount of real-world feedback

Cons

  • Not sized for dogs under 18 pounds
  • The 27 inch collar length may need trimming even on some large breeds

Specifications

Breed size
Giant, Large

Performance notes

The collar measures 27 inches and is recommended for large, extra-large, and giant dog breeds. It offers three correction modes, beep, vibration, and shock, and carries an IPX7 waterproof rating along with a 1 year warranty from the manufacturer.

What buyers say

Forty reviews averaging 4.4 stars is a modest but decent sample size for this category, enough to suggest the fence performs close to what is advertised for most buyers, even if it is not a huge body of feedback.

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Frequently asked questions

What size dogs is this fence designed for?

It is built for dogs over 18 pounds, specifically large, extra-large, and giant breeds. The collar length and correction strength are not intended for small dogs.

What is the maximum coverage range?

The boundary is adjustable from 25 up to 999 yards, which makes it suitable for anything from a standard yard to a large rural property.

What correction options does the collar offer?

It has three levels, beep, vibration, and shock, so you can start with the mildest warning and only move up if your dog needs a stronger correction to respect the boundary.

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