bought this for our two dogs: a 17-pound shih Tzu/dachshund mix and a 55-pound Australian Shepard/Catahoula mix. took my girls all of about two tries before they found out where the boundary was. two of my neighbors bought the same system which is pretty cool cause when we have block parties we can bring our dogs and not worry about them wondering off.the only thing i will say, is UPGRADE THE WIRE. i am telling you, if you do this right off the bat you're gonna be SOOOOO much happier. the wire that is provided is super thin and easily breaks. save yourself the trouble and just upgrade right away. after burying the wire around the ENTIRE property (we live on a 1/2 acre), within a month the wire got snapped by some critter digging under the fence. SO we had to dig the wire back up (after trying to find where the break was) and just decided then to upgrade the wire. i bought upgraded wire from lowes for $40 (we needed 1 1/2 rolls). it's going on about a year now and the upgraded wire has lasted a LOT better than the provided wire ever would have.