# MIXJOY 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.

- [Original product page](https://best-deals.pro/product/mixjoy-pet-mat-bk-004-xl-dog-car-seat-extender)
- [View offer](https://best-deals.pro/visit/mixjoy-pet-mat-bk-004-xl-dog-car-seat-extender)
- Market: US
- Language: en-US
- Currency: USD
- Brand: MIXJOY
- Model: PET-MAT-BK-004
- Category: Pet Supplies > Pet Toys & Accessories
- Price: 71.99 USD
- Previous price: 79.99 USD
- Discount: 10%
- Price checked: 2026-11-13T05:41:59.760Z
- Rating: 4.3 / 5
- Reviews: 44

Prices and deal status are the latest recorded data, not a guarantee of availability. Confirm the price and availability with the store.

## 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.

## Pros

- Two storage pockets and mesh side panels add practical features for road trips.
- The listing says the cover is machine washable.

## Specifications

### Identity
- Brand: MIXJOY
- Model: PET-MAT-BK-004
### Materials and protection
- Material listed: Oxford Fabric
- Color: Grey
### Size and care
- Dog breed size: Large
- Product dimensions: 34"L x 22"W x 21.5"H
- Care instructions: Machine Wash
- Strap type: Adjustable

## Before you buy

- 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.

## In the box

- Dog car seat (Included)
- Dog safety belt (Check selected pack): A feature claim says one is included, but the explicit contents entry lists only the dog car seat. Confirm the selected listing.

## 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 feedback

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.

## Alternative options

- [Tivray Elevated Dog Car Seat for Small and Medium Dogs Up to 35 lb \| 4" High-Density Foam Dog Car Bed, 2 Storage Pockets,3 Safety belts,Fully Removable and Washable for Easy Care,Black+Gray](https://best-deals.pro/visit/tivray-ps250454-elevated-dog-car-seat)
- [FURTIME Dog Car Seat Cover for Back Seat, PU Leather Back Seat Extender \| Hard Bottom Holds 400LBS, Waterproof Anti-Scratch, Large Space Back Seat Pet Cover for Car, SUV, Small Truck](https://best-deals.pro/visit/furtime-pc0008-bk-pu-leather-dog-car-seat-cover)
- [Bench Back Seat Cover for Dogs, Rear Dog Car Seat Covers for SUV & Truck \| 100% Waterproof, Easy Install & Clean, Secure Non-Slip Fit, Scratch Protection, Universal Fit, Heavy-Duty Materials](https://best-deals.pro/visit/petloox-bench-back-seat-dog-cover)
- [IIVZJY Dog Seat Cover Back Seat Anti Scratch Backseat Protector 600D Orange \| Pet Hammock with Mesh Window, Incredibly Easy to Install,Prevents Falls,Easy to Clean Dog Bed for Car, SUV, Truck](https://best-deals.pro/visit/mixjoy-pet-mat-bk-004-xl-dog-car-seat-extender)
- [Zanch Truck Back Seat Cover for Dogs, XL Hard Bottom Seat Extender, Organge \| Fits crew cab trucks, full-size SUVs & vans; 29 x 56 in hard bottom; one side folds for a rider; mesh window; 3-yr warranty](https://best-deals.pro/visit/mixjoy-pet-mat-bk-004-xl-dog-car-seat-extender)
- [Lealchum Dog Booster Car Seat for S/M Dogs Up to 35lbs,Soft 6in Elevated Cushion,Fits in Front/Back Seat,Fully Detachable and Washable,2 Storage Pockets & 3 Straps,Easy to Install \(Black/Brown,Medium\)](https://best-deals.pro/visit/lealchum-lesft01-medium-dog-booster-car-seat)
- [Kimdog Upgraded Dog Car Seat Cover for Back Seat, Hard Bottom Seat Extender \| 45% More Space, Strong Support, Waterproof, Anti-Scratch, 8-Layer Protection, Machine Washable, Dog Hammock for Car/SUV/Truck](https://best-deals.pro/visit/mixjoy-pet-mat-bk-004-xl-dog-car-seat-extender)
- [Dog Car Seat Cover for Back Seat, Hard Bottom Fully Enclosed Hammock \| Strong Suppo...](https://best-deals.pro/visit/mixjoy-pet-mat-bk-004-xl-dog-car-seat-extender)
- [Dog Car Seat Cover For Back Seat, Waterproof Hammock for Car, Black \| 600D Oxford, ...](https://best-deals.pro/visit/mixjoy-pet-mat-bk-004-xl-dog-car-seat-extender)
- [Dog Car Seat Cover for Back Seat, Waterproof Dog Seat Cover for Back Seat, Hard Bot...](https://best-deals.pro/visit/mixjoy-pet-mat-bk-004-xl-dog-car-seat-extender)
- [Large Dog Car Seat,Back Seat Extender for Dogs,Hard Bottom Seat Cover \| Waterproof,...](https://best-deals.pro/visit/mixjoy-pet-mat-bk-004-xl-dog-car-seat-extender)
- [Hard Bottom Dog Car Seat Cover for Back Seat,Seat Extender for Dogs \| Strong Suppor...](https://best-deals.pro/visit/mixjoy-pet-mat-bk-004-xl-dog-car-seat-extender)

## Add-ons

- [COOYOO Dog Seat Belt,3 Piece Set Retractable Dog Car Harness Adjustable Dog Seat Belt for Vehicle Nylon Pet Safety Seat Belts Heavy Duty & Elastic](https://best-deals.pro/visit/mixjoy-pet-mat-bk-004-xl-dog-car-seat-extender)

## Images

![MIXJOY PET-MAT-BK-004 XL Dog Car Seat Extender — 1](https://best-deals.pro/i/ZRQLnvXKXNbJd7G9mPRHaVFFygvdUdXnHMkJ534WF3OXHbEqUpn-8ebsAew46yZJvr91XID6X44hZnUiQIqUkeUyPZ9kllSOF-9h1X_kQQs-hnqqeaNzqzEV.jpg)

![MIXJOY PET-MAT-BK-004 XL Dog Car Seat Extender — 2](https://best-deals.pro/i/dz9EE9IHjmxkhDjj7gb58ppnHkX38DFwvqBotmc0qiH2jPjcBm1FKg01RIOEg5lmUDyzn9nZiQTHBVDLX4oAQS0yc3eiA0rkuAo5KSV_J2q_IYepsUg6iaia.jpg)

![MIXJOY PET-MAT-BK-004 XL Dog Car Seat Extender — 3](https://best-deals.pro/i/nrp2XjMhzLChj3-khqashJzsanzET9vgRypAg9MvnjvGkX9owvfsTcWAH7YjxaQsBIc6DGO7OY5ACAoA3TPP9x0xm2sPbjezooLkDq7l5Oig5klDJb1pjMTO.jpg)

![MIXJOY PET-MAT-BK-004 XL Dog Car Seat Extender — 4](https://best-deals.pro/i/LHlubAyWjnS4cM8JP2rVGwFaKimu7FPxKLp1by_o_EBXBBlbrawTbTeFbPz2Bo-2eYy01M1RZTo1BdE8syIPlnfxi5zMKF7gGo2RTIGD8MWCpSJ5PZfaFqsx.jpg)

![MIXJOY PET-MAT-BK-004 XL Dog Car Seat Extender — 5](https://best-deals.pro/i/rFOaf-JeP6lq7RPYuNzmMfRA20WRO7dOz6yPh29JZ6LIkwf6xw-sBQ4XaTURQpSXYg8dtyu3lTpHRJNW9PvYpfTdhKUAd1lfTHBLHZjTA7RR88HK5yGUI7RH.jpg)

![MIXJOY PET-MAT-BK-004 XL Dog Car Seat Extender — 6](https://best-deals.pro/i/ddKOD1gLZOIqkfFP7GH8e1yG3sOSppebpdqkpnUvXzVmE0hE2OaVUYeOf5ldZj56CfBXeDM2xxtor3RARGSsgEoic5mmqtEm6Mb9WR_63dkA5gwI8fnylTvE.jpg)

![MIXJOY PET-MAT-BK-004 XL Dog Car Seat Extender — 7](https://best-deals.pro/i/tQ9snqc0VtoV7zQJPmviISkeWBYcPkK3-8iESv17m-fXBGT4gR58lS2WIvirdIc-gBuZGr9up-NwO9ox2JW72z4K3yR7ahiQGncrlPKcuKZXXBYo8LA_Thzh.jpg)