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    • Find the best GPS device for your dog

      We build this technology and more into our Whistle smart devices and app. So you can get the best smart device experience and give the best care too.

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      Whistle Switch GPS Smart Collar
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    • Find the best health tracker for your dog

      Track and translate your dog's behavior into in-depth daily health insights. So you always know how they’re doing—and can take action ASAP if a change points to a potential health issue.

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      Whistle Health 2.0 Smart Device
      Health 2.0
    • What can you do with the Whistle app?

      Whistle’s easy-to-use app lets you understand health insights, track your pet’s location, quickly connect with a vet, and so much more.

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      How Whistle helps

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© 2025 . All Rights Reserved. Whistle is a brand of Science & Diagnostics, a division of Mars Petcare.

Questions?

We're here 10am - 6pm EST
Monday - Friday
1-855-999-0471

Call us Email us
  • About us
  • Press
  • Blog
  • FAQ
  • Contact us
  • Support
  • Refund policy
  • Device Limited Warranty
  • Accessibility
  • Refer a Friend, Get $20!
  • Pet Insight Project
  • Careers
  • Affiliates
  • Terms of service
  • Privacy Statement
  • Cookie Notice
  • Modern Slavery Act
  • Your Privacy Choices
  • AdChoices
Download on the App Store
Get it on Google Play
Accessibility

© 2025 . All Rights Reserved. Whistle is a brand of Science & Diagnostics, a division of Mars Petcare.

Terms & Conditions Privacy policy Accessibility
Size Guide
XS/S
Neck size:8” - 11”
For Dogs:5 - 25lbs
Breeds like:Russel Terrier, Dachshund
S/M
Neck size:12” - 18”
For Dogs:10 - 55lbs
Breeds like:Beagle, Cocker Spaniel
M/L
Neck size:16” - 24”
For Dogs:Up to 75lbs
Breeds like:Labrador Retriever, German Shepherd
How to Measure:
1
Grab a string, shoelace, or paper strip to measure the base of your dog’s neck.
2
Measure the circumference, leaving room to fit two fingers (about 1.25-1.5’’).
3
Select your size using the guide below. Between sizes? We suggest sizing up.

Need help? Give us a call: 1-855-999-0471

Size Guide
S
Neck size:8” - 11”
For Dogs:5 - 25lbs
Breeds like:Russel Terrier, Dachshund
M
Neck size:12” - 18”
For Dogs:10 - 55lbs
Breeds like:Beagle, Cocker Spaniel
L
Neck size:16” - 24”
For Dogs:Up to 75lbs
Breeds like:Labrador Retriever, German Shepherd
How to Measure:
1
Grab a string, shoelace, or paper strip to measure the base of your dog’s neck.
2
Measure the circumference, leaving room to fit two fingers (about 1.25-1.5’’).
3
Select your size using the guide below. Between sizes? We suggest sizing up.

Need help? Give us a call: 1-855-999-0471

Size Guide
S/M
Neck size:12” - 18”
For Dogs:10 - 55lbs
Breeds like:Beagle, Cocker Spaniel
M/L
Neck size:16” - 24”
For Dogs:Up to 75lbs
Breeds like:Labrador Retriever, German Shepherd
L/XL
Neck size:18" - 26.5"
For Dogs:Up to 75lbs
Breeds like:Akita, Rhodesian Ridgeback
How to Measure:
1
Grab a string, shoelace, or paper strip to measure the base of your dog’s neck.
2
Measure the circumference, leaving room to fit two fingers (about 1.25-1.5’’).
3
Select your size using the guide below. Between sizes? We suggest sizing up.

Need help? Give us a call: 1-855-999-0471

Terms and conditions

*Offer valid for 1 Whistle Health Limited Edition device and a subscription to the Whistle app for as long as the user is part of the MARS PETCARE BIOBANK™ study. Offer while supplies last on whistle.com. Offer is non-transferable and only valid for MARS PETCARE BIOBANK™ recipients. Not valid on previous purchases. You are not required to provide credit card information unless you decide to continue your subscription beyond the expiration of the MARS PETCARE BIOBANK study project. Whistle may modify or cancel offer at any time.

Thanks for participating in the

As a study participant, Whistle is excited to offer you a FREE Whistle Health smart device and app subscription. Whistle™ Health uses industry-leading AI to translate your dog’s behavior into in-depth health insights. You’ll know how they’re doing at all times, and learn how to spot potential health issues sooner.

Why do I need a subscription?

A Whistle subscription keeps you connected via the Whistle App, so you can always get your pet’s full activity and health story.

Subscriptions cover GPS location tracking (for Go Explore 2.0 & Switch), health and fitness monitoring, sleep monitoring, weight tracking, the ability to share reports with your pet’s care team, and access to our Ask a Vet feature.

Your pet’s healthiest life starts now.

Join the Whistle pack for exclusive offers and new product announcements.

Sign up for product updates, offers, and learn more about Whistle, and other Mars Petcare brands. Must be over 16 years to sign up.

See our privacy statement to find out how we collect and use your data, to contact us with privacy questions or to exercise your personal data rights.

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Puppy wearing Whistle GPS Tracker for Dogs