I have 2 four-legged cat, rabbit, critter repellent machines...they're called dogs! A pom and an american eskimo...the pom is the "boss", she trained the other one and it works. The yard stays fairly critter free, her favorite morning activity is chasing the birds out of the yard. We live in a town with no laws on the books regarding rabbits so most gardens are fair game. If they ( rabbits) hear the door open they know Zoie is coming out and they are gone!! If any cat moves it's game,the ones who ignore Zoie are safe but she has put the fear in all the neighborhood cats.