Installing the Heavy Duty Dog Door® or Big Dog Door™ On A House Door

Installing on a house or garage door

measure height

Measure height.

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 six to twelve inches.)
Mark the height in pencil on one side of your door.

Drilling and cutting hole
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 half inch in each corner. Insert jigsaw into drill hole and cut out hole. See photo 1.

If installing on a steel door, cut hole 6/8″ (3/4″) larger, glue 3/8″ pine, cedar, or plywood strips to inside of the opening. 
See photo 2.

Need pre-cut wood? Order our Pet Door Trim Kit.If installed on a raised panel door, cut hole in center of door 6/8″ (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.
(See our Pet Door Trim Kit)

Pet Door Trim Kit Steel door trim kit photo

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) inch by (1/4) inch lengths. Again, either glue,
nail or screw to door surface as the photos illustrate.

hollow core door
Hollow core reinforcement
wood strips


draw template
Draw template/drill 1/2″ holes.
Opening 12-1/2″ x 17-1/2″ on
the Heavy Duty Dog Door®,
16-1/2″ x 25-1/2″ on the
Big Dog Door™.

template on raised panel door
Cut raised panel door surface
same as Photo 1
(Order Pet Door Trim Kit)
Photo 2

sealing trim on metal door
Use silicone caulking around trim kit for add insulation. To quiet door closing staple 5/8″ window felt to sides and bottom.
Photo 5

closing panel
Installed door trim kit.
Photo 6

jigsaw cutting hole
Jigsaw cutting to each
(1/2″) drilled corners
Photo 1

installing dog door trim kit on metal door
Steel door: Note hole is cut
3/4″ (6/8″) larger to allow for 3/8″ thick wood inserts. Opening 13-1/4″ x 18-1/4″
on the Heavy Duty Dog Door®,
(Order Our
Pet Door Trim Kit)

17-1/4″ x 26-1/4″ on the Big Dog Door™.
Photo 3

frame of trim kit for metal doors
Frame the inside and outside of the hole on the door – use 3/8” cedar, pine or plywood strips — 1-3/4″ or 2” wide.
Photo 4

dog door in passage door
Heavy Duty Dog Door® installed
on a metal door.