A dog car seat cover protects upholstery from hair, mud and claws. It is not a safety device, and the distinction matters because covers and restraints are often sold together as though buying one handles both. A dog on a beautiful waterproof cover is still an unrestrained dog in a moving vehicle.
Bench covers lie flat across the seat and leave the footwell open, which suits dogs that like to step down. Hammock covers sling from the front headrests to the rear ones, closing off the footwell so a dog cannot slide into it during braking. For most dogs the hammock is the better choice; for dogs that dislike an unstable surface, the bench is.
No. The AVMA is explicit that unrestrained pets are a hazard to themselves and the driver, recommending crash-tested vehicle harnesses designed for seat belts or secured carriers. A hammock stops a dog reaching the front; it does nothing in a collision, where an unrestrained animal continues forward at the vehicle’s speed.
Waterproof backing under a scratch-resistant face fabric, with a non-slip underside. The waterproof layer is what separates a cover from a blanket — it is the one that stops mud and accidents reaching the upholstery underneath. Quilted faces trap less hair than smooth ones and are easier to shake out.
Four anchor points: headrest straps front and rear, seat-anchor tabs pushed into the crease between base and back, and a non-slip underside. Covers held by headrest straps alone bunch up under a moving dog within a single journey, and a bunched cover is what makes dogs decide the back seat is unpleasant.
A boot liner plus a secured crate is the safest arrangement in an estate or SUV, because a crate anchored to the vehicle restrains the dog properly and contains everything else. A dog loose in an open boot with a liner is protected upholstery and an unprotected dog — the same trade as a seat cover.

See the dog car hammock guide or browse Walking & Traveling Supplies.
Wash the cover rather than the car. That is the practical argument for a removable machine-washable cover over a fitted liner: hair and odour live in the fabric, and a cover you can put through a wash weekly keeps the vehicle neutral in a way that vacuuming the seats does not.

Into the footwell, no — that is the design. Forward in a collision, yes, without a harness.
Most are sized for standard rear benches. Check length and headrest spacing for large SUVs and small hatchbacks.
Avoid anything that covers a seat-mounted airbag. Check your vehicle manual for seat airbag locations.
Give it something better to do — a chew that only appears in the car works for most dogs.
Yes. A crash-tested harness clipped to the belt is the restraint; the cover is only upholstery protection.
Better in a secured crate. Puppies move constantly and need containment as well as covering.
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