Though may not work as well, or be stable enough, for larger cats, plastic dishes and bowls are perfect for medium to small cats.
Things to Consider:
Hazards with Plastic – The biggest challenge with plastic dishes and bowls is that they scratch, and the scratches can become a breeding place for bacteria. To avoid this, you need to wash plastic dishes and bowls regularly.
Feeding Stands – Because plastic bowls are lighter, you might want to consider buying a feeding stand that the bowls can fit. Not only is a feeding stand better for your cat´s posture and joints, it will also steady the plastic bowls, keeping them from tipping or pushed.
Avoid Deep Feeders – Most cats prefers shallow dishes. You should try to avoid narrow, deep feeders.
