Originally Posted by hwichlaz:
You can transfer the latch for your slider, to the doggy door insert. 
and add a strip of mohair from the hardware store for the draft.
They don't line up right to latch and it doesn't fit on the insert.
We do have some kind of weather stripping but it doesnt do much.
Our slider is original from the 70s. I can't wait to replace it someday.