PetSafe Never Rust Electronic Pet Door - Automatic Dog Door with Sensor Collar Key - Smart Dog Door for Large Dogs up to 100 lb

Across the reviewers we read, the PetSafe Never Rust Electronic Pet Door is the most-discussed collar-key smart door in specialist dog communities. Multiple high-trust r/dogs threads describe positive multi-year ownership, including one commenter reporting roughly 5,000 open cycles with no failures and another specifically calling out that PetSafe sells replacement parts — a meaningful durability signal that came up more than once. r/Pets (medium trust) notes a one-week acclimation period because pets have to learn to pause for the unlock click rather than push through a passive flap.

The honest counterweight is also in r/dogs: a high-trust thread about smart doors generally notes false opens and limited sensor range as recurring pain points, and the 3.9-star Amazon average across 4,382 reviews reflects a non-trivial share of buyers who hit installation or sensor-tuning frustrations. It is sized for pets up to 100 lb and uses a collar SmartKey rather than microchip, which scales well to multi-pet households (up to five keys) but adds a fob your pet has to wear. For dog-primary homes, the consensus across mainstream reviewers and specialist communities is that this is the safe, well-supported pick.