Cat repellant mats are a great a non-toxic way of say “No Trespassing to cats”. Simply place the mat in the area where you want to discourage feline excavation. The flexible plastic spikes are harmless, but effective. They can also deter dogs and other small animals. Put it around your flower patch or flower pot so as to prevent cats from invading. Repellant mats are humane and chemical-free way of discouraging cats, dogs and other small animals from disturbing your garden.