1 / 7MIXJOY PET-MAT-BK-004 XL Dog Car Seat Extender
The MIXJOY PET-MAT-BK-004 is an XL back-seat dog seat extender with Oxford fabric, storage pockets and mesh sides. Its claimed extra space and washable cover suit owners seeking a designated rear-seat area, but fit and the listed dimensions need clarification before purchase.
At a glance
- The listing claims the extender adds 40% more back-seat space for a dog.
- Two storage pockets and mesh sides are listed for small-item storage and airflow.
- Waterproof, slip-resistant and scratch-proof performance are manufacturer claims, not independently confirmed.
Often bought together
Pros and cons
Pros
- Two storage pockets and mesh side panels add practical features for road trips.
- The listing says the cover is machine washable.
Technical specifications
8 specifications| Brand | MIXJOY |
|---|---|
| Model | PET-MAT-BK-004 |
| Material listed | Oxford Fabric |
|---|---|
| Color | Grey |
| Dog breed size | Large |
|---|---|
| Product dimensions | 34"L x 22"W x 21.5"H |
| Care instructions | Machine Wash |
| Strap type | Adjustable |
What to know before buying
Listing details to confirm
The dimensions are inconsistent across listing details: one entry gives 34"L x 22"W x 21.5"H, while another gives 34 x 22 x 21.5 inches and also includes a weight. Confirm the selected listing's dimensions and vehicle fit. The claimed 40% space increase and protection performance are not independently confirmed.
What’s in the box
- Dog car seatIncluded
- Dog safety beltCheck selected pack
Check which accessories are included in your selected pack before buying.
Who is it for?
A good fit for
- Dog owners looking for a rear-seat extender with a washable cover and storage pockets.
- Buyers whose vehicle back seat can accommodate the confirmed product dimensions.
Less suited to
- Shoppers who need confirmed fit measurements before ordering or independently documented crash-safety performance.

Customer reviews on Amazon
- 5 stars
65% 65% - 4 stars
12% 12% - 3 stars
14% 14% - 2 stars
6% 6% - 1 star
3% 3%
The supplied evidence contains aggregate ratings but no customer comments. The distribution leans positive, while a notable share is in the middle and lower star categories. Ratings alone do not identify what buyers liked or disliked, so they cannot confirm fit, durability or the claimed protective performance.
Frequently asked questions
What are the listed dimensions?
One detail gives 34"L x 22"W x 21.5"H. Another gives 34 x 22 x 21.5 inches and adds a weight. Because these entries conflict, confirm the dimensions before buying.
Can a person sit beside the dog?
The listing claims passengers can sit alongside a dog with this seat extender, but it does not give vehicle-specific fit measurements.
How is the cover cleaned?
The care field says Machine Wash. Follow any care instructions supplied with the selected item.
Does it include a dog safety belt?
A feature claim says a dog safety belt is included. The explicit contents entry lists only a dog car seat, so confirm whether the belt comes with the selected package.

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