As far as the latch, I took a look at ours. I would probably sink a good quality eye hook in the adjacent wall, hook a small bungee cord into it, wrap it once or twice around the door handle, and hook it back to the eye hook. If that allows too much "give" so the pet can slip out, use a cord or chain with less or no flex to it.
Land of 10,000 Lakes
2016 Forester MBS 2401R
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2016 FR Forester 2401R
Towing 2014 Honda CR-V
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