4Knines Hard Bottom Back Seat Extender for Dogs – Waterproof Dog Car Seat Cover – Heavy Duty Backseat Protector for Cars, SUVs, Trucks – Built-in EZ Open Door Protector (Patent Pending) Grey, XLarge
$179.99
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Product description
1 Regular Size
2 Extra-Large Size
The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked. door guard Merchant Video
The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked. seat extender Merchant Video
1 Heavy Duty
2 Waterproof
3 Seatbelt Access
4 Straps & Clips
Effortless Installation for Hassle-Free Rides! Quick And Easy Installation. No Tools Needed.
Installs in seconds with quick-release clips! Designed with busy pet owners in mind, our seat extender sets up in no time, so you can spend less time on installation and more time enjoying the journey with your furry friend.
The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked. seat extender Merchant Video
Seat Extender Check out if the 4Knines Seat Extender is the right fit for your needs!
Wondering if a seat extender is what you need? Check out how it transforms your rear seat into a spacious, comfy area—perfect for multiple dogs or pups who love to stretch out.
The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked. Seat Extender Merchant Video
Floor Hammock Check out if the Floor Hammock is the right fit for your dog and your truck!
The 4Knines floor hammock is perfect for trucks with fold-up rear seats, offering a cozy spot for large dogs, heavy shedders, or pups who need a little extra help getting in. Great for dogs who love to sprawl and relax on the go!
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Crew Cab Rear Seat Cover See if our Crew Cab Seat Cover is the perfect solution for your truck and pets!
The 4Knines Crew Cab Rear Seat Cover offers all-around protection with a hammock that can be tucked away when not in use. Perfect for small or large trucks, it’s designed for dog owners who need easy under-seat storage access and for trucks that see daily action.
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Split-Tech Rear Seat Cover Find out if our Split-Tech Seat Cover offers the convenient features you need!
With split-technology, this cover provides access to fold-down seats and the middle armrest, offering flexibility for your backseat needs. Choose from options with or without a hammock and with or without a mesh window for the perfect fit.
The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked. split tech Merchant Video
Regular Seat Cover Check out if our Regular Seat Cover is the simple solution you’re looking for!
If you’re looking for just the essentials, our Regular Seat Cover with a hammock design provides basic protection for your backseat. Simple, functional, and perfect for those who need a no-frills solution for keeping their seats clean and safe from pets.
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Customer Reviews
4.6 out of 5 stars 77
4.6 out of 5 stars 938
4.7 out of 5 stars 2,120
4.7 out of 5 stars 6,123
4.6 out of 5 stars 1,033
4.6 out of 5 stars 2,989
Price
$159.99$159.99
$129.99$129.99
$99.99$99.99
$69.99$69.99
$99.99$99.99
$69.99$69.99
Hammock
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Heavy Duty Materials
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Waterproof Seat Bottom
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Fold Down Seat Compatible
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Middle Seat Belt Access
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Arm Rest Access
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Available Colors
Black, Grey
Black, Grey, Tan, Camo
Black, Grey, Tan, Camo
Black, Grey, Tan
Black, Camo, Grey, Tan
Black, Grey, Tan
Available Sizes
Regular: 54″wide; XL: 60″wide
One size: 60.5″ wide
Regular: 54″wide; XL: 60″wide
Regular: 54″wide; XL: 60″wide
Regular: 54″wide; XL: 60″wide
One size: 54″ wide
Truck Specific
Regular:mid-size; XL:full-size
Crew Cab Trucks
Regular:mid-size; XL:full-size
Regular:mid-size; XL:full-size
Regular:mid-size; XL:full-size
Fits mid-size trucks
EXTRA DURABLE HARD BOTTOM SUPPORT: The 4Knines hard bottom car seat cover extends your rear bench seat into a stable platform for dogs of all sizes. Reinforced panels provide exceptional support, creating a sturdy, non-collapsing surface for a safer, more comfortable ride. Includes a zippable mesh panel that allows easy access to your pet from the front seat if needed.
BUILT-IN DOOR PROTECTOR WITH EZ OPEN DESIGN: Keep your car’s interior in top shape with an integrated door cover, preventing scratches, dirt, and slobber while allowing dogs to enjoy open windows without damage. Our patent-pending EZ Open Door Panel Protection features a one-zip system for effortless in-and-out access.
LUXURIOUS COMFORT & SPACE: This backseat extender for dogs transforms your backseat into a cozy dog-friendly area—a must-have dog road trip essential. Regular Size fits most vehicle models, while XL Size fits full-size trucks, crew cab trucks, and large SUVs. Fits 2024, 2025, and 2026 models great! **NOT recommended for use with captain chairs – this cover is not designed to bridge the gap between seats without support for the middle panel. Fits 2024, 2025, and 2026 models great!
HEAVY-DUTY, WATERPROOF CAR SET COVER: Crafted from premium materials, this seat cover features a waterproof K9 Shield that protects against spills, fur, and dirt. The high-quality fabric is resistant to wear and tear, keeping your vehicle clean and looking like new. This dog car seat cover for back seat is easy to wipe clean or hose it down outside and hang to dry.
SECURE, NON-SLIP FIT & SAFETY FEATURES: Stay worry-free—our non-slip backing, seat anchors, and seat belt access points keep the dog back seat extender firmly in place. The reinforced design prevents shifting, reducing distractions while ensuring your pup’s comfort on every ride. Sizing recommendations are based on standard vehicle layouts and may vary. Please measure your seats in the intended configuration to ensure the best fit.
IMPORTANT SAFETY NOTE: When installed in a full-size truck, the hard bottom seat extender creates a high jump for your dog when getting in and out of your truck. Depending on your dog’s size, health, and agility, they may need assistance to safely enter and exit.
8 reviews for 4Knines Hard Bottom Back Seat Extender for Dogs – Waterproof Dog Car Seat Cover – Heavy Duty Backseat Protector for Cars, SUVs, Trucks – Built-in EZ Open Door Protector (Patent Pending) Grey, XLarge
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$179.99
Toni –
Would definitely recommend!
I absolutely love this! It was easy to set up and fits great in my 2014 Prius. I like that the sides of it hang off of the handles on the ceiling rather than hooking into my window (since I have tinted windows, don’t want that scratched up). Plus, that’s great for keeping my dog in the car while i’m still training her to wait to be released. It’s easy enough to zip open/closed, but I will say it needs 2 hands most of the times just due to going around a corner.I bought a plush mat to go in on top of this to help with the slipping around since it’s not the most grippy thing for dogs.But so far, cleaning it has been easy. I’ve had a couple of throw-up accidents while driving and they cleaned up with a damp rag pretty quick. But the most important thing is that it didn’t soak through to my seats!Also love the extender part of this. Having a wider floor for my pup is a huge win.
Chris C –
Perfect for a Subaru Forester, very good quality and at a good price.
I love it. It fits perfectly in my Subaru Forester. And, the hard bottom that extends the seat and covers the well provides more than ample room for my two 60lb dogs. Construction seems high-quality. Separately, I also purchased a padded blanket/cover that makes it soft and should capture fur. Note that this hard-bottom seat extender does not have slits in it for tethering the dogs’ harnesses to the seat belt receptacles. That seems odd, though I suppose one could the slit themselves… which I may do. However, not having slits keeps all the dogs sand on the cover and further protects the seats.
Kaylorsan –
My dog loves it
Nice quality. Fits well. Very secure.We are using this in a 2025 Porsche Macan
Butch J –
Easy to Use and Well-Made, But Not as Supportive as Advertised
The 4Knines Hard Bottom Back Seat Extender is light, easy to put on, and the fabric quality is excellent. It fits well and immediately gives my dog more usable space. The downside for me is the support. Even though it’s advertised as being able to handle hundreds of pounds, it does bend a bit when my Goldendoodle stands up front and looks between the bucket seats. I also use a seat wedge to level things out, and since the wedge is a little short, the section not resting on it ends up feeling flimsy. I just wish it supported his weight a bit better overall.What you may care about:• Great-quality fabric and very easy to install.• Hard bottom helps, but can flex under bigger dogs.• Works best with a fully level surface underneath.
Heather S –
The best back seat dog cover!
I LOVE this dog carrier!! Its really sturdy for my 80lb coonhound. This had really been an amazing upgrade. It looks so solid and classic in back seat, not like a saggy hammock. I move it in and out of my car every week so super easy to use. I dont use the sides because my dog likes to put his head out window and the sides really prevent that. I just wipe it down on occasion and vacuum it. I have recommended this to friends!
W. Ruffner –
Excellent fit in a Tahoe
We bought the large version of this for the back of a 2017 Chevy Tahoe. It fits perfectly, and is even nicer than I’d hoped. The upcoming long roadtrips should be very comfortable for our furry guy.I just picked up a restraint that connects his harness to the seat belt system, and I was surprised & happy to discover that there were already Velcro-closed access slots, right where it was needed. Perfect again.
Paulette –
Great quality cover!
Rating the product 5 stars for quality! The back of the Ram 1500 Quad Cab is narrow a with the seats down the cover sits at a slant. Not sure the dog will like that so I put a mat down on top even though it’s too big but gives it a little more height. Have not had the dog in yet as she hates being in any vehicle. Cover is very durable and it was easy to installl. The hard bottom does give it more stability..
Rene’ K. –
Great fit for my Tacoma. (Size large)
Great versatility. I’m not using the door guards or the part that hangs from the back of the front seats. I have it attached it to the back headrests and it’s anchored. The other parts are folded underneath. It provides my dog with extra room and no worries about him falling in the area where your legs would go. I did add a big blanket on top for extra comfort and my dogs loves his new traveling setup.