You can do a test at home to get a visual on how big the opening is and to see how comfortable this flap opening is for your doggie, where you open your sliding door to the width of the flap (eg. Medium 21cm flap width) and then measure Flap Height opening by placing a measuring tape inside bottom of the track, and measure up 38cm (Medium Flap Height 38cm includes 5cm rise at the bottom) and at flap height 38cm please place or sticky tape a piece of cardboard across and let your doggie go through the opening.

Make sure your doggie’s back is going through nice and straight without having to bend down.

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