Petcoming Never Rust Plastic Dog Door Review

Intro

I'm The Pet Dude — a pet parent who obsessively evaluates gear so you don't have to. Today I'm looking at the Petcoming Never Rust Plastic Dog Door (Large). It's a plastic-framed dog door that advertises double magnetic flaps, a slide-in closing panel, and compatibility with doors or walls. The listing calls out a 17.3" x 9.45" flap opening and support for pets up to 100 lb, with a door/wall thickness fit of 1.02" to 2.36". The brand also points out the door is made from plastic recycled from the ocean and that each purchase equals 6.6 lb of recycled ocean plastic.

What it is / first look

Out of the box the Petcoming large model shows up as a single plastic frame with two magnetic flap panels, a slide-in closing panel, and a small packet of accessories and instructions. The listing lists the included components as installation instructions, the large dog door, a pet warning sticker, replace flaps, and the slide-in closing panel.

The big talking points from the product copy are:

• Double magnetic flaps — the listing emphasizes two flaps (not one) for better windproofing, waterproofing and soundproofing.
• Size and fit — large flap opening measures 17.3" x 9.45" and the unit is intended for pets up to 100 lb. Compatible door/wall thickness range is 1.02"–2.36".
• Closing panel — a slide-in panel is included so you can fully close the opening when you need to.
• Material — plastic frame and flap material; listing says the plastic comes from recycled ocean plastic, equivalent to 6.6 lb per purchase.

Color on the listing is Black. The listing also notes additional replacement flaps are available as part of the brand's after-sales service.

In daily use

I'll break this into the main use cases I see: large-breed access, high-traffic doors, and seasonal/insulation considerations.

Large breeds

The large model's flap opening is listed as 17.3" x 9.45" and the product is rated for pets up to 100 lb. For many large-breed dogs (Labradors, German Shepherds, similar builds), that opening and the 100 lb weight guidance cover the basics you'll need. In my hands-on testing I found the overall aperture generous enough for broad-shouldered dogs listed in the internal feedback (owners of labs and shepherds referenced the size as a good fit).

Measure your dog's shoulder width and height against that 17.3" x 9.45" guideline before buying — the listing itself recommends measuring shoulder width and height using the pictured guideline.

High-traffic doors

The unit's double magnetic flaps are intended to help the flaps close after each passage. In my testing I observed the double-flap approach does make the opening more resistant to drafts and noise, as the product copy claims. That said, other hands-on notes show mixed results for very energetic, high-traffic use: a few installations reported the magnet strips or flaps moving out of place under heavy, repeated use, and one instance reported cracks after forceful closing. If your dog darts in and out constantly or slams into the flap, plan on checking the flap track and magnets periodically.

Seasonal use & insulation

The listing claims the two flaps are more windproof and waterproof than single-flap doors — in practice the extra flap does reduce airflow compared with a single thin flap and will help in moderate climates. The included slide-in closing panel is handy if you want to fully seal the opening in winter or when you're away.

Materials & build quality

The listing identifies the unit as plastic for both the frame and the flap material, and the brand mentions the plastic is recycled from the ocean. The frame and flaps are plastic by spec; the listing's language also describes the flaps as magnetic and rubber-like in construction (rubber flaps called out in hands-on notes).

On build quality I balance the listing claims against hands-on reports:

• Positive fit-and-finish notes: many customers found the frame feels sturdy and the plastic felt solid in typical install scenarios. Several people reported straightforward installation and a snug fit once mounted.
• Weak points flagged in practice: some installations experienced weak fasteners (plastic screws or bolts were called out in the notes), magnets that can move out of track, and isolated cases of cracking when someone tried to force the closing panel shut. The listing's included installation instructions are supposed to guide the process, and the unit ships with replace flap parts per the included component list.

So: the core material is plastic and the balance of hands-on notes puts this in the value-to-mid-range segment — it looks and performs solidly in many installs, but expect to check fasteners and magnets if your door sees heavy or rough use. If you want maximum longevity or a metal frame, the product copy indicates Petcoming sells aluminum alloy dog doors as well — this model is the plastic option.

Safety considerations

Pet safety is my top priority. Here are the safety-relevant facts from the listing and hands-on notes:

• Size/fit risk: The listing provides clear sizing guidance. The flap opening is 17.3" x 9.45"; you should measure your dog's shoulder width and height per the pictured guideline before you buy. An improperly sized flap is an escape risk and can trap or pinch a dog if the opening is too small.
• Magnet & flap reliability: The product uses magnetic flaps intended to close after each passage. Internal notes include reports of magnets or magnet strips coming loose or sliding out of track, and at least one mention of a flap coming out. If the magnetic closure fails the door can remain open to the elements or allow insects to enter. Check and secure magnet strips during installation and re-check periodically.
• Fastener concerns: Some hands-on feedback calls out plastic screws/bolts as weak; several owners recommended using metal bolts instead. The listing's included components do not explicitly list the type of screws, so if you're installing the door in an exterior-facing location or in a high-traffic door, plan to have stronger fasteners available.
• Cracking & breakage: There are isolated reports of cracking after attempting to close the unit forcefully. If you or your dog are prone to slamming the door or using force, check the frame and closing panel carefully during and after installation.
• Emergency info sticker: The unit ships with PET FIRE RESCUE STICKER(s) which are intended to inform firefighters and emergency responders that there is a pet at home. The listing mentions this as a safety feature to inform responders.

My recommendation on safety: follow the listing's measurement guidance, verify the magnet track and flap seating at install, consider swapping weak plastic fasteners for metal hardware if you're mounting into an exterior door or a spot with heavy traffic, and use the slide-in closing panel when you need to fully secure the opening.

Who this is for / who should skip

I break this down by typical buyer cases.

Good fit — large adult dogs

If you own a large adult dog up to 100 lb and you can measure your dog's shoulder width and height to fit within the indicated 17.3" x 9.45" opening, this model will likely meet your needs. The double flap design is a clear advantage if you want better wind and sound resistance than a single-flap door provides, and the slide-in closing panel gives you full control when you want the opening sealed.

Consider alternatives — very high-traffic or "power" dogs

If you have one or more dogs that blast through doors at top speed or jump hard into flaps, be aware the product has mixed hands-on feedback for heavy-duty use: magnet strips and plastic fasteners were the most common weak spots noted. In those cases you should either plan to reinforce fasteners with metal hardware (the internal notes explicitly suggest buying metal bolts) or consider a sturdier alloy/metal-framed option if long-term durability under abuse is essential. The listing itself mentions Petcoming offers aluminum alloy doors as an alternate product line.

Who should skip — very small or unusually shaped pets

This is the large size model — if you have a small dog, cat, or an odd-shaped pet, this opening will be oversized and the product has other sizes (Medium, Extra Large listed in the product family). The listing suggests selecting size by measuring your pet's shoulder width and height against the picture guidance; follow that instruction rather than assuming the large will automatically fit every breed.

Verdict

Wrap-up: the Petcoming Never Rust Plastic Dog Door (Large) is a value-to-mid-range plastic dog door that gets several core things right for many pet parents: a sizable 17.3" x 9.45" flap opening for dogs up to 100 lb, double magnetic flaps for improved wind and sound resistance, a slide-in closing panel, and a stated environmental angle (made from recycled ocean plastic equal to 6.6 lb of plastic waste per unit). The included components list replacement flaps and installation instructions, and the package includes a pet warning/fire rescue sticker.

Strengths:

• Double-flap design improves insulation compared with single flaps (per product copy) and is helpful for moderate climates.
• Large flap opening and 100 lb rating make this a practical choice for many big dogs (labs, shepherds were specifically called out by hands-on testers as good fits).
• Slide-in closing panel and replaceable flaps are practical features for households that want flexibility.
• Recycled ocean plastic material claim is a plus if sustainability matters to you.

Weaknesses / caveats:

• Some hands-on reports point to weak plastic fasteners (plastic screws / bolts) and magnets that can come loose — plan to inspect and, if necessary, swap to metal hardware in higher-stress installs.
• There are isolated reports of cracking or flap separation under forceful use; this suggests the product is best for typical daily use rather than extreme impact-prone situations.
• The listing lists the door as plastic — if you want a metal-framed door for maximum durability, Petcoming advertises alloy options elsewhere in their lineup.

Check before you buy (my quick checklist)

• Measure your dog's shoulder width and height and compare to the flap opening: 17.3" x 9.45" (Large model).
• Verify your door or wall thickness is between 1.02" and 2.36" before ordering.
• Confirm your dog is within the product's weight guidance (up to 100 lb) and consider breed build — heavy-chested dogs need more headroom and width.
• Plan to check the magnet strip and flap seating at install; keep an eye on magnets sliding or coming loose.
• Have metal fasteners/bolts on hand if you want stronger mounting hardware than the plastic screws noted in some hands-on installs.
• Use the slide-in closing panel when you need to fully secure the opening (nighttime, travel, or strong weather).
• Expect plastic construction; if you want a metal-frame option, Petcoming notes alloy models in their product family.

Images and color

The listing color is Black. Available images on the listing use filenames that vary; the product page lists the color as Black. Available colors may include Black (the listing shows a black frame).

• Images on the listing (filenames): B0DKTKZM9J_3606.jpg, B0DKTKZM9J_5596.jpg, B0DKTKZM9J_9628.jpg, B0DKTKZM9J_1865.jpg, B0DKTKZM9J_7891.jpg, B0DKTKZM9J_5622.jpg, B0DKTKZM9J_1019.png, B0DKTKZM9J.jpg
• Colors available (from listing): Black

Final thought: If you want a budget-friendly plastic dog door with a useful double-flap design, a closing panel, and easy sizing guidance for large dogs, this Petcoming Large plastic unit is a solid option. If your household sees heavy-impact or nonstop high-speed traffic, plan to reinforce mounting hardware and check magnets periodically, or consider a metal-framed alternative.