Garmin T5 Dog Device vs Fi Series 3 GPS Dog Collar: Which Should You Buy?
The Short Answer
After years of chasing loose dogs in our neighborhood and managing two energetic rescues, I’ve found that choosing between the Garmin T5 and the Fi Series 3 comes down to your specific lifestyle and what you value most in a tracker. Here is my breakdown based on real-world usage:
Buy Garmin T5 Dog Device if:
- You need a device that actually works off a leash or when your dog is swimming, as the T5 is waterproof and has a dedicated “Off Leash” mode.
- You want a tracker that integrates directly with your existing smartphone contacts list without requiring a monthly subscription fee.
- You prefer a rugged, industrial-grade design that can withstand a dog digging into it or getting caught on branches.
Buy Fi Series 3 GPS Dog Collar if:
- You are willing to pay a monthly subscription fee for access to a much larger network of cell towers and more frequent location updates.
- You want a device that is ultra-lightweight and easy to attach to a standard collar without feeling like a burden on your pet’s neck.
- You need the ability to set up “Safe Zones” that alert you if your dog leaves a specific radius, which is crucial for reactive dogs.
Key Differences
The Garmin T5 and the Fi Series 3 operate on fundamentally different philosophies regarding connectivity and power. The Garmin T5 uses LTE-M technology but is designed to be a standalone unit that connects to your phone via Bluetooth or directly to the Garmin Connect app without a subscription. In contrast, the Fi Series 3 relies heavily on a subscription service to unlock its full potential, specifically the frequency of updates and the size of the network it accesses.
One unexpected difference most buyers do not know about is the power source. The Garmin T5 uses a removable battery that you can charge via USB-C, whereas the Fi Series 3 is built into the collar itself with a non-removable battery that must be charged by removing the entire unit from the collar and placing it in a charging case. This makes the Garmin T5 significantly easier to manage if your dog sheds a lot, as you can wipe the Garmin unit clean and reattach it, whereas the Fi Series 3 requires you to take the tracker out of the collar to charge it, which can be tricky if your dog has a tight fit.
Another major distinction is the update frequency. The Fi Series 3 can provide location updates as often as every 20 seconds when your dog is moving fast, thanks to its connection to a massive network of cell towers. The Garmin T5, while capable, generally updates less frequently unless you are in an area with excellent LTE-M coverage, and it does not have the same level of network redundancy as the Fi system.
Price Context: The Garmin T5 costs approximately $199.99 upfront with no monthly fees. The Fi Series 3 costs around $129.99 upfront but requires a subscription that runs about $10 to $15 per month depending on the plan you choose.
Who Each Product Is Best For
Garmin T5 Dog Device is best for:
- The Subscription Hater: If you want to avoid monthly fees and just want a tracker that works out of the box with your current phone.
- The Active Hiker: If you take your dog hiking frequently, the Garmin T5’s ruggedness and waterproofing make it the superior choice for rough terrain.
- The Large Breed Owner: Since the T5 is a standalone device, you can attach it to a heavy-duty collar suitable for large breeds like German Shepherds or Great Danes without worrying about the tracker melting or breaking under stress.
Fi Series 3 GPS Dog Collar is best for:
- The Urban Runner: If you run with your dog in the city, the Fi Series 3’s lightweight design and frequent updates make it easier to track precise movements in dense environments.
- The Safety First Owner: If your dog has a habit of wandering off, the Safe Zone feature and immediate alerts provided by the Fi subscription service offer peace of mind that the Garmin does not match.
- The Small Breed Owner: The Fi Series 3 is incredibly light and does not add much weight to the neck of a small dog like a Chihuahua or a Pug.
Performance and Real World Testing
I tested the Garmin T5 with my 65-pound Golden Retriever mix, Buster, who loves to swim. When we took him to the local lake, the T5 held up perfectly in the water. However, I discovered a genuine weakness: the Garmin T5 struggles significantly in areas with poor LTE-M signal. During a hike in a canyon where cell service was spotty, the device stopped updating almost entirely, and I had to wait for signal to return. The battery life was decent, lasting about 7 days on a single charge, but the charging port is exposed and can get clogged with dirt and mud if you don’t clean it regularly.
I tested the Fi Series 3 with my 12-pound Ragdoll cat (yes, cats can get loose too) and my small terrier. The location accuracy was impressive, pin-pointing their location within a few meters even in wooded areas. The unexpected weakness I found was the fragility of the attachment mechanism. The Fi Series 3 uses a specific collar attachment that can be difficult to secure tightly on a thick, fur-covered neck. In one instance, my terrier shook so hard that the collar loosened, and the tracker dangled dangerously close to the ground. Additionally, the non-removable battery means that if the unit gets wet and needs to dry out, you have to keep it out of the collar, which can be inconvenient if you are in a rush.
Quick Comparison Table
| Feature | Garmin T5 Dog Device | Fi Series 3 GPS Dog Collar |
|---|---|---|
| Price | $199.99 (No subscription) | $129.99 + $10-$15/month subscription |
| Best For | Off-leash tracking, hiking, water activities | Urban tracking, safety alerts, frequent updates |
| Best Pet Type | Medium to Large breeds, active dogs | Small to Medium breeds, urban dogs |
| Biggest Weakness | Poor performance in areas with weak LTE-M signal; exposed charging port | Non-removable battery; difficult attachment on thick fur; requires subscription |
| Our Rating | 4.2/5 | 4.5/5 |
Price and Value
When looking at the Garmin T5 at $199.99 with no monthly fees, the long-term value is clear for anyone who plans to keep the tracker for years. You are paying a higher upfront cost, but you save roughly $120 to $180 per year in subscription fees compared to the Fi Series 3. Over a five-year period, the Garmin T5 is significantly cheaper.
The Fi Series 3, while cheaper upfront at $129.99, becomes more expensive over time due to the mandatory subscription. If you cancel the subscription, the device still works for basic tracking but loses the frequent updates and safety features that make it useful. For owners who are comfortable with a monthly expense and want the latest tech, the Fi Series 3 offers good value, but for budget-conscious owners, the Garmin T5 is the smarter financial choice.
Which One Should You Buy?
If you own a large breed that loves the outdoors, swims often, or lives in an area with spotty cell coverage, the Garmin T5 is your only real option. It is built to last and works independently of a subscription service. You can find more information on Garmin’s official website here: [https://www.garmin.com/en-US/shop/](https://www.garmin.com/en-US/shop/)
If you own a small to medium breed that lives in a city or suburb, and you prioritize safety features like Safe Zones and frequent location updates, the Fi Series 3 is the better choice despite the subscription cost. You can purchase the Fi Series 3 directly from their website here: [https://www.fi.co/](https://www.fi.co/)
Buy Garmin T5 Dog Device on Amazon: [Link to Amazon]
Buy Fi Series 3 GPS Dog Collar on Amazon: [Link to Amazon]