The short answer
Door-mounted flaps are the simplest cut. Wall doors use a telescoping tunnel and suit homes where cutting a door isn't possible. Sliding glass inserts fit your patio track with no cutting, which suits renters. Screen and window doors are for light, warm-weather use.
Options compared
| Type | Cutting | Best for |
|---|---|---|
| Door flap | Cut the door | Homeowners, simple installs |
| Wall door | Cut the wall (4 3/4–7 1/4 in typical) | When doors can't be cut |
| Sliding glass insert | None | Renters, patios |
| Screen / window | None or minimal | Summer, small pets |
Examples
- Wall: PetSafe Wall Entry fits walls 4 3/4–7 1/4 in thick.
- Glass: Hakuna Pets glass insert pressure-mounts with no drilling.
- Screen: PetSafe Screen Door snaps into screens.
Before you cut
- Check walls for wiring, pipes and studs.
- Check doors for metal or glass panels.
- Read your lease.
SafetyPatio inserts narrow the opening; add a security bar to the sliding door.
Products mentioned
Questions readers ask
Can renters install a dog door?
Patio inserts and screen doors usually need no cutting.
How thick a wall can a wall door fit?
PetSafe's fits 4 3/4–7 1/4 in, with extension kits for thicker walls.