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Product guide

Thule Cappy Dog Car Harness, Large (771003)

The Thule Cappy dog harness, model 771003, is a step-in harness intended to secure a large dog in a car using a seatbelt passed through rear loops. Adjustable straps, padded mesh panels and a leash loop also support day-to-day handling.

At a glance

  • Rear loops allow a vehicle seatbelt to pass through the harness, which the listing says helps limit forward movement.
  • Step-in construction avoids pulling the harness over a dog's head.
  • Separate adjustment straps are intended to be set once without changing the opening and closing adjustment.
  • Padded mesh panels are described as providing airflow and soft support. The title also claims easy cleaning.
  • The listing describes the harness as crash-tested and TÜV approved. These are manufacturer claims, not independent verification here.
Price
$118.95Save 21%

Reference price: $149.95

Price checked: Nov 13, 2026

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Often bought together

Pros and cons

Pros

  • Seatbelt passthrough is designed for car travel and the listing describes it as helping reduce forward movement.
  • Step-in access can simplify putting the harness on dogs that dislike gear being pulled over their heads.
  • Padded mesh panels and separately adjustable straps offer practical comfort and fit features.

Cons

  • The one-size listing is also labelled for large dogs, so shoppers with dogs outside that stated size range may find the fit unsuitable.

Technical specifications

9 specifications
Identity
BrandThule
Model771003
Dimensions and installation
Dimensions listed38.1 x 26.92 x 4.06 cm; 500 g
Weight listed500 g
Materials and protection
Material listedPolyester
Fit and configuration
Listed sizeOne Size
Dog breed sizeLarge
ColourBlack
Closure typeZipper

What to know before buying

  • Crash-testing and TÜV approval are listing claims. Customer feedback reports mixed views on safety, fit and comfort, so check the harness fit carefully and follow its vehicle-use instructions.

What’s in the box

Included
  • Harness

Who is it for?

A good fit for

  • Owners of large dogs looking for a step-in harness with seatbelt passthrough for car rides.
  • Buyers who prefer a harness with separate fit adjustment and padded mesh panels.

Less suited to

  • Dogs that do not fit a large-dog, one-size harness.
  • Buyers seeking a product whose crash-safety performance is independently verified by this guide.
Thule Cappy Dog Car Harness, Large (771003) · photo 2
Additional product photo 2

Customer reviews on Amazon

4.3 / 5 · 94 ratings
  • 5 stars66%66%
  • 4 stars17%17%
  • 3 stars7%7%
  • 2 stars6%6%
  • 1 star4%4%

Customer feedback describes the harness as solid and easy to use, including easier harnessing. Views on safety, fit and comfort are mixed. For car travel, ease of putting it on may matter, but mixed fit and safety impressions make it sensible to assess fit carefully and treat the crash-testing statement as a listing claim.

Positive themes

  • Customer feedback highlights perceived durability and ease of use.

Mixed feedback

  • Customer feedback reports mixed opinions about safety, fit and comfort.

Frequently asked questions

How is the Thule Cappy attached for car use?

The listing says to pass the vehicle seatbelt through loops on the back of the harness. It describes this as helping keep the dog secure and minimize forward movement.

Does the harness go over a dog's head?

No. It has a step-in design, which the listing says avoids pulling it over the dog's head.

What size is this model listed for?

The specifications say One Size and Large dog breed size. Check the fit against your dog's measurements before buying, as no measurement range is provided here.

Is crash testing independently confirmed?

The listing claims crash-testing and TÜV approval, but those claims are not independently verified in the supplied information.

Thule Cappy Dog Car Harness, Large (771003) · photo 3
Additional product photo 3

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