What's the best pet door for a sliding glass door if I rent?

No-cut sliding-glass panel inserts are the renter-friendly choice because they drop into the existing track without modifying the door or glass. Verified-purchase reviewers widely praise them for easy installation, but the most important honest caveat surfaced in specialist threads is sealing: several reviewers report drafts and a small gap where the panel meets the jamb, so weatherproofing matters in cold climates.