Gun Dog Heavy Duty Dog Door

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  • Heavy-duty doggie doors for large, active dogs
  • Durable, aluminum frame and acrylic flap withstands hyper dogs and rough climates
  • Thick flap is chew proof
  • Installs in kennels, doors, and walls with proper framing
  • Available in one large size

Engineered by an owner of highly active labradors in Minnesota, the Gun Dog Heavy Duty Dog Doors are sturdy, long-lasting designs made to withstand extreme weather conditions. Featuring a thick, acrylic flap, this Gun Dog house door is one of the only chew-proof pet doors on the market. Longevity and durability are ensured with this installation.


  • Brushed aluminum frame installs in kennels, doors, and walls with the appropriate framing.
  • Clear, acrylic flap is ¼” thick to withstand chewing and highly active dogs.
  • Large flap size is 11” wide x 15” high to accommodate pets up to 120 pounds. Make sure to measure your pet to ensure that the gun dog door will work for your dog.
  • Purchase includes the flap and frame. Any materials needed for your particular installation must be purchased separately.
  • A closing cover can be purchased separately if desired. It mounts on the opposite side of the door or wall from the pet door. A sturdy, ¼” thick polypropylene panel slides down aluminum channels over a 14” x 20” opening. If you would like this closing cover to be lockable, drill a ½” hole through the cover and wall on the inside and insert a short dowel.


  • Heavy-duty dog door flap is a reliable option for active dogs.
  • Clear flap is easy for dogs to see through.
  • Weather-tight design endures severe climates.
  • Warranty covers chewing in the case that your dog is an adamant, excessive chewer.
  • Great fit for large, energetic dogs. 

Size Chart

Flap Size Flap Dimension Rough Cut Out
Large11" w x 15" h12 1/2" w x 17 1/2" h

You can order Gun Dog Closing Covers

Additional Information


Brushed Aluminum

Flap Dimension

11" w x 15" h

Frame Material


Flap Material


Flap Colors


Flap Thickness


Warranty Period

5 years limited

Return Period

30 days

Rough Cut

12 1/2" w x 17 1/2" h

Flap Type

Single Flap

Your Maximum Pet Size

Medium Dogs, Large Dogs

Climate Suitability

Severe-4 Season

Flap Design

Single, Two Part, Rigid, Thin Flap

Ability to Lock Flap

No Flap Lock Provided

Can Be Installed In

Kennel Wall, Solid Core Door, Walls

Sealing Value


Wind Resistance


Insulation Value


Installation Instructions

Gun Dog House Door ® / Heavy Duty Dog Door ® / Big Dog Door™

Pet Door Installation Instructions

Installing On a Wall

Installing on a House or Garage door

Drop-in Closing Panel Installation Instructions

Guillotine Closure Installation Instructions

"Special" Dog Door Training for the "Timid Dog"

Installing On a Wall:

The Heavy Duty Dog Door ® and Big Dog Door™ are installed on the outside surface of a building, wall or door, etc.

measure the height of your pet to make sure you have the correct size
Measure height


Step #1:

Measure the belly height of your pet from ground level to his underside to find the correct height of the door opening. Bottom edge is usually from 6" to 12". Do not mount flush to ground.

For the Heavy Duty Dog Door ™ cut the opening 12-1/2" wide x 17-1/2" high. For the Big Dog Door ™ cut the opening 16-1/2" wide x 25-1/2" high.

Frame out the depth of your wall to create the walk space for your pet
Example of tunnel
in frame wall

Step #2:

If mounted on garage or house wall, frame the depth of the wall to form a tunnel through the wall. (Use 2" X 4" or 2" X 6" material.) If needed, add a least a 1/2" x 1 1/2" flat outside mounting surfacing.

place your frame over the opening to begin final install steps
Cut opening, if
needed add a 1-1/2"
flat mounting surface.

Step #3:

Place door over opening and use the enclosed two 1 1/2” wood screws to hold door to opening.


Step #4:

Show dog how to use door. Your dog will learn to use your pet door almost at once, but there are a few which may be a little nervous at first.

The most important rule is to be patient.

Do not let the dog have a bad experience or it may become frightened.

Most dogs can be trained to use a pet door in a matter of hours. Your dog will respond to encouragement, repetition and play in particular.

Alternatively, use the door flap as part of a game - throw a ball through, for instance. As your dog responds to your encouraging calls, help it through the door, patting and congratulating it. Repeat the game several times, continually encouraging the animal with positive gestures and comments. Within a short time your dog will be totally familiar with its pet door and use it happily on its own.

Problems…see Special Dog Training Instructions at end of page

a finished product after correct installation will close properly at the bottom
This is how an
installed door looks.

Installation Tips: Install 1/8" felt or rubber weather stripping on surface of building or door. Do not put rubber weather stripping on Gun Dog House Door®.

NOTE: If your door does not close at the bottom, the door is installed incorrectly. Unscrew door and move 1/4" lower. If there is a gap between top strap and upper doorframe, move door 1/4" higher.


Installing on a house or garage door:

measure height of your pet before beginning installation

Measure height.

Step #1:

The Heavy Duty Dog Door® and Big Dog Door™ are installed on the outside of a house door.

Determine Height
To find correct height of the hole for your dog, measure the belly height of your pet (Average installation is 6"-12".)  Mark the height in pencil on one side of your door.

use a jigsaw for cutting the hole opening
Jigsaw cutting to each
(1/2") drilled corners

The Heavy Duty Dog Door hole size is 12-1/2" x 17-1/2". For the Big Dog Door the hole size is 16-1/2" x 25-1/2".

Drill a half inch hole into each corner. Then draw lines to connect the corners. Insert jigsaw into drill hole and follow drawn lines to cut out hole.

installing in a steel location requires cutting a little larger to the inside of opening
Steel door: Note hole is cut 3/4" larger to allow for 3/8" thick wood inserts. 

Step #2:

If installing on a steel door, cut hole 3/4" larger, glue 3/8" pine, cedar, or plywood strips to inside of the opening

If installing on a raised panel door, cut hole in center of door 3/4"/ Glue 3/8" pine, cedar, or plywood strips to inside of the opening to cover styrofoam and install trim to inside/outside of door surface.

for hollow installation locations use wood reinforcements
Hollow core reinforcement wood strips 

If installing in a hollow core door. use four strips of wood the same width as the hollow between the panels in your door. Position the wood so that they are flush with the edges of the hole. Either glue, nail, or screw the strips. Frame the outside/inside hole with 2" x 1/4" lengths.

to increase insulation value use silicone caulking provided in installation kit


Step #3:

Use silicone caulking around trim kit for added insulation. To quiet door closing, staple 5/8" of the window felt to the sides and the bottom of the pet door.

Drop-in Closing Panel Installation Instructions:

closing panel channels should be installed on the inside of the building
Install channel on inside of building

Step #1: Closing panel is installed on the inside of building or door.

Step #2: Construct a 2" wide frame on inside mounting surface.

Step #3: Place channel angle one inch from dog door cut opening.

Step #4: Install one-inch tabs at the base of each channel.

Step #5: Slide heavy-duty closure into channel. Remove as needed.

Guillotine Closure Installation Instructions:

a template is provided to begin the three step process for installation

Step #1:

Place panel against wall as a template. Install each channel so the panel slides in its grooved track.

Step #2:

Drill hole or install a eye hook in panel. Install two pulleys to ceiling and attach a cable/rope to the 3/8" polypropylene panel.

Step #3:

Slide polypropylene panel in channels as needed.

"Special" Dog Door Training for the "Timid Dog":

even puppies can use this heavy duty doggy door with ramp
This little 7 week old Lab pup is already a pro at using the Gun Dog House Door®.

Whether you have an adult dog, or a new puppy, teaching him how to use a Gun Dog House Door® (GDHD) will be done the same way.

When you install your dog door, make sure you measure the "rise" of your dog (the measurement from the floor to the lowest part of your dog's chest or stomach). This measurement tells you where to place the "bottom" of your dog door. The bottom of your dog door should be an inch lower than the "rise" of your dog. If you have a puppy you will need to install the dog door one inch from the ground; and you will need to re-install it at higher intervals as your puppy grows. Another option is to take an educated guess as to how tall your dog will eventually be, install the dog door at the appropriate height, and construct a "puppy-ramp" so your puppy can reach the dog door and go through it comfortably.

puppy using the clear dog door with hard flap which helps them push easier

Once the frame of the GDHD door is installed in a wall or door, leave the GDHD off at first. Have someone stay inside with your dog while you go outside. Call your dog through the "hole" (door frame without the GDHD). When he goes through and comes to you, praise him lavishly and give him a treat. Now have the person inside the house call him through the "hole." When he gets to them, they should praise it and offer a treat as well. Do this at least 3 times and no more than a dozen. After this, your dog will know there is a hole in the wall or the door especially for him.

patience and a structured schedule is necessary for proper training

Leave the GDHD off the cut opening for one full day. Encourage him to use his opening by not letting him use the "real" doors. Instead, you use the real door and say to your dog, "Go to your door!" pointing in the direction of his dog door. You may need the help of someone inside to "help" the dog find his new door. After a half a dozen times, your dog should like this new game! If you have a very young puppy, do not expect them to learn "Go to your door" for many weeks or months; still give them the command in a happy voice, and have someone inside show them where their door is every time. It sometimes helps if you are outside (after going through a real door) and someone else helps your dog or puppy find the doggie door as you call him from outside.

On the second day, install the GDHD. Now, you will need to repeat the same exercise as when you first sent your dog through the "hole." But this time, the person on the same side of the door as the dog will need to "push" the GDHD open for him. Each time the dog goes through the door, push the GDHD less and less for him. It is important that the dog gets used to the feel of the GDHD on the back of his head so once your dog has begun going through the door, let go of the GDHD so he feels it on his head and body as he goes through the door. Eventually the dog will need to push the GDHD by himself and dogs are usually hesitant to do this at first. He will probably put his nose down by the bottom of the GDHD and wait for the GDHD to move (after all, it has up to now). At this point, push the GDHD slightly so that your dog can see it is a moveable object, let the GDHD bounce back to the closed position. The best way I can explain it is that you are "poking" GDHD using short, quick pokes. This gives the dog a glimpse of an opening and encourages him to poke the door himself. At this stage, some dogs begin going through the door with ease, others become quite excited, but still haven't figured out that they can push the door open. If your dog will not push the door open by himself yet, remove the GDHD and install a piece of carpet onto the opening. You want the carpet to have a least a _” opening on the sides and bottom. The dog should feel more comfortable pushing the carpet on its own. After 2-3 days, install the GDHD and with our enthusiastic encouragement and praise, your dog should be able to push the GDHD now with no problem



Gun Dog "Heavy Duty" Dog Door

Heavy Duty Dog Door In Use by Big and Small Dogs


Can I use this on a regular house installation?

Since this is made for dog kennels, these doors can be loud when they close. We don't recommend them for residential use, but you can install them into a regular door if needed.

Is this available as a large dog door?

The Big Dog Door is simply a larger version of this door and has a 15" x 23" flap.

Can I lock the door?

You can purchase a closing cover that fits over this door's heavy-duty spring hinges, but it does not come with one.

Is this a great door for large and small pets?

It can be pretty heavy, so if you have big and very small pets that will be sharing the door, we would suggest that you take a look at the Easy Door.

Will it insulate well?

Yup! This door is weatherproof and energy-efficient.

Can I put this on a wall?

Wall installation will work only if the wall is framed out properly.

Is this loud?

Because of the plastic and metal banging against each other, it is louder than most pet doors. Like electronic dog doors, timid dogs may have some difficulty using the door.

Does this door swing both ways?

Yes, the door will allow the pets in and out.

Would I install this on the inside or outside?

Normally you would want to install this metal dog door on the exterior.

Can this be installed in a door?

Yes, but if it is a hollow-core door, you will have to frame out the inside of the cutout. Be careful with measuring so that you get the correct frame size.

Can this be installed into a sliding glass door?

This is not the best dog door for sliding glass doors. For weatherproof alternatives, try Ideal Pet Products' Ruff Weather series, the double flap Endura Flap pet doors, and Petsafe dog supplies.


Gun Dog House Door® Co.

The Heavy Duty Dog Door®, Big Dog Door™, Easy Dog Door™ is covered by a limited lifetime warranty. We warrant this product to be free of defects in materials or workmanship for the life of your dog. Damage caused by accident, improper installation or abuse is specifically excluded from this warranty. Gun Dog House Door® Co. is not responsible for any incidental or consequential damage resulting from use of this product. Normal wear and tear excludes the hinges from warranty. Customers are responsible for all shipping costs.

Partial returns and/or damages will not receive full credit. Items damaged through USE or due to return shipping damage will receive partial or no credit. Should you decide that you wish to refuse receipt of an item when delivered by UPS, USPS, FedEx or common carrier and legitimately ordered the product, credit will be issued minus any shipping custom fees and charges.

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