Plastic dog gates and playpens are made from several types of plastic: generic plastics and polyethylene, blow-molded/high-density HDPE constructions, and in some child/pet gates 100% post‑consumer recycled plastic.

Plastic gates and playpens use several mounting methods: frame-mounted and freestanding designs, pressure- or tension-mounted gates (no drilling), suction cups for indoor anchoring, and ground stakes for outdoor anchoring.

Most models include a lockable gate or door rail. Some playpens and gates use push‑and‑slide or lockable door-rail mechanisms that let pets pass through while helping prevent escapes.

Plastic playpens and gates are typically aimed at small to medium-sized pets; some products explicitly state suitability for pets weighing up to about 44 lbs.

Assembly varies by model: some require adult assembly with tools (often included), while others advertise quick, tool‑free setup—pressure‑mounted gates typically require no drilling or tools.