Thule Cappy Dog Harness L, Model 771003

Model: The Thule Cappy Dog Harness is a size L step-in harness designed for car travel, with seatbelt passthrough loops and a separate fit adjustment. Its backseat restraint setup and padded mesh panels suit buyers seeking a harness that can serve both car rides and leash use.

At a glance

The listing describes the harness as crash-tested and TÜV approved. These are manufacturer claims, not independently verified here.
Back loops are designed for routing a vehicle seatbelt through the harness to limit forward movement.
Dedicated fit straps are separate from the opening and closing mechanism, so the listing says the size only needs to be set once.
A step-in design avoids pulling the harness over a dog's head.
Padded mesh panels are described as providing support and airflow.

Price

$94.95Save 21%

Reference price: ~~$119.95~~

Price checked: Nov 14, 2026

View offer

Pros and cons

Pros

Seatbelt passthrough loops give it a defined backseat restraint setup without a separately described tether.
Separate fit adjustment and step-in access may make routine fitting simpler.
Padded mesh panels offer a comfort-focused design for travel.

Technical specifications

6 specifications

Identity
Brand	Thule
Model	771003

Dimensions and installation
Dimensions listed	15 x 10.6 x 1.6 inches; 1.1 pounds

Design and use
Harness style	Step-in Design
Car restraint feature	Seatbelt Passthrough
Leash feature	Leash Loop

What to know before buying

Confirm that size L fits your dog's measurements before buying. Customer feedback is generally favorable about fit, especially for larger dogs, but some buyers say the harness does not accommodate a wide size range. The crash-test and TÜV approval statements are listing claims, not independently verified here.

Who is it for?

A good fit for

Dog owners seeking a step-in harness with seatbelt passthrough for backseat trips.
Buyers who prefer a harness with separate fit adjustment and leash loop.

Less suited to

Buyers who need a fit guaranteed across a broad range of dog sizes without checking measurements.

Thule Cappy Dog Harness L, Model 771003 · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.4 / 5 · 97 ratings

5 stars68%68%
4 stars16%16%
3 stars6%6%
2 stars9%9%
1 star1%1%

Customer feedback highlights perceived build quality, ease of use and appreciation for the crash-tested design. Fit reports are mixed: some customers say it fits well, particularly on larger dogs, while others say the available sizing does not cover a wide range. This matters because the harness depends on an appropriate fit for its seatbelt-passthrough use. Overall ratings lean positive, but do not establish fit for a particular dog.

Positive themes

Customers describe the harness as high quality and solidly built.
Customers report that it is easy to use.

Mixed feedback

Fit feedback includes reports of a good fit, particularly for larger dogs, as well as concern that the sizing range is limited.
A customer summary notes a report that the seatbelt holds securely through the harness when pulled quickly. This is an individual observation, not a verified performance result.

Frequently asked questions

How does the Cappy harness attach in a car?

The listing says to pass the seatbelt through the back loops to secure the dog in the backseat and minimize forward movement.

Does it go over a dog's head?

No. It uses a step-in design, so the harness is put on without pulling it over the dog's head.

How should I check the fit?

The listing identifies this as size L and describes dedicated adjustment straps. Compare your dog's measurements with the size guidance on the selected listing, since customer feedback includes both positive and mixed fit experiences.

What comfort features are described?

The listing describes padded mesh panels intended to provide soft support and airflow.