My 7 month old cat keeps escaping the house from small cracks in the door as we leave or come back inside. I've caught her each time a few minutes after she got out. She is a good climber and we've seen her jump 3 1/2 feet, so a baby gate doesn't seem effective (plus most are climbable). She does wear a bell collar but it's breakaway and she discards it when we aren't looking. I want to avoid a normal collar if possible. Thoughts?