Dog-proofing the screen door. Cover the inside bottom half with a piece of clear acrylic window pane so the dogs can't bust through the screen, but you can still see out.
Drill holes at each corner and screw it onto the inside screen door frame. Now screw on a latch bolt near the top of the acrylic pane.
With the main door open, you can come and go un-locking the screen door coming in by using the slider opening above where the bolt you put on is to reach through to pull over the bolt.
Problem! If you forget and leave the screen door bolted and close the outer main door (or the wind does), now you can't get in unless you yank hard to break the connection between the main door and the screen door handle.
A dog could figure out how to lift the little knob and slide open the latch bolt in no time, but so far ours have taken pity on us by pretending they don't know how.