- 1). Measure your existing glass panes and write down the measurements. Then measure the height of your dog from the floor to the top of his shoulders and measure across his chest to get his width. Use these measurements to determine the size of the door flap within the doggy door's frame. The actual door including the frame will be about two inches wider and two inches higher than these measurements. Contact a custom doggy door manufacturer and order the door to be made to best fit your dog and your door.
- 2). Remove one glass panel. Pry the trim off the inside of the door using a prying tool. Slide the end of the tool under the trim and tap the head gently until the trim loosens. Remove the trim around all four sides of the glass on the inside of the door. If the pane is secured with fasteners, pry them off, and carefully slide the pane out of the door. For large dogs you may have to remove two or more panes, but make certain the door will not collapse before you do so.
- 3). Install the doggy door per the manufacturer's instructions. Different manufacturers have different methods of attachment. Replace and secure the trim framework. Introduce your furry friend to the door. Stand on the other side with a treat to entice him to jump through.
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