It is an intermediate do-it-yourself project, and it will give your dog freedom and unlimited access to the outside.
Pet doors come in many sizes, so it is important to measure the largest pet that will use the door. Measure your dog from the top part of its shoulders to the lowest part on the chest and add 2 inches. Also make sure that it is at least 2 inches wider than your dog.
Make sure your dog is full grown and allow for any weight gain.
Tape a template to the door, outlining the doggie door, making sure it fits where you want it and there are no problems.
Use a 1/2-inch drill bit and work 4 holes into each corner of the drawn outline. Once this is done, change the drill bit to a 3/8-inch piece and drill the holes for the outer surround.
Make sure that the larger holes in the corners stay inside the outline.
Using the jigsaw, insert the blade into 1 of the 4 1/2-inch holes and begin cutting along the outline. Once finished, the inner section can be removed
Insert the flap-less outer surround into the hole from the exterior side of the door. This should lie flush and can be modified using the small break off levels on the inner part of the surround. Use the pliers to break of these levels until the entire outer surround sits perfectly against the door.
Screw the outer surround into place using the 3/8-inch holes as a guide.
Caulk the inside edges of the outer surround to make it air tight once the flap is fitted.
The flap can now be screwed into place on the interior side of the door on the section provided. Be careful not to over-tighten as this can cause splits in plastic models.
The pet door is ready to use. Encourage pets to use the pet door by coaxing them with gentle nudges and an occasional treat!
It was suggested to us to hold the flap up for a while so your dog can get used to going through the opening first. Put a treat on one side and when the dog goes through to get it show them that there is another one on the other side. Do this several times and they quickly learn to go through the door.