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A Dog Hard Bottom Seat Extender with better Door Guards
We studied 2,078 competitor reviews and surveyed 178 people. Then we built the fix: patent-pending EZ Open door guards that stay off your windows, pivot open with one zip, and come off whenever you want.
Nearly 3 in 4 people we surveyed want removable door guards. Most built-in guards can't come off. Ours can.
425 of 952 competitor reviews on built-in door guards were negative or mixed. The #1 complaint: window inserts and Velcro.
Sources: 4Knines survey of 178 people, Oct 2 to 9, 2026. 4Knines analysis of Amazon reviews of 7 competing products, Oct 3 and 6, 2026. See the research
No plastic inserts in the window channel. No Velcro hanging from the glass.
Unzip, the guard pivots open, and your dog jumps right in.
Want them off? Take them off. Need them back? Put them back.
A door guard design you won't find on other seat extenders.
We’ve got a seat cover for every vehicle—check out our patented Split-Tech design!
Our patented Split Rear Seat Cover provides access to all three seat belts and allows you to fold up seats without having to remove the cover (60/40 split, 50/50 split).
Companions for Heroes’ vision is to help every American hero while saving shelter and rescue animals from euthanasia. Since its inception, C4H has paired over 3,500 heroes with shelter dogs.
Mike and Joyce recognized a great need for a support system for disabled pets, and this grassroots nonprofit was born! It has evolved into a thriving rescue, rehab center, and adoption resource for disabled animals.
Since 2015, Paul has saved over 1600 furry friends from euthanasia by transporting them from from high-kill shelters in the south to no-kill shelters in the northeast.
4Knines started with a simple idea during a car ride. Our Dobermans had destroyed yet another dog seat cover, and we were tired of options that couldn't handle fur, nails, and mud from our adventures. So in 2013, we created our own. After years of testing and listening to our customers, we’ve improved our covers over 11 times. Now, we have a strong, high-quality dog seat cover built to last.
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