On top of what Jonesy stated. I do not like the name of this product they are not fences. A fence not only keeps things in but also out. You still have to worry about dogs coming into your yard starting fights or just plain messing with your dog. If you have a female in heat then very easy acsess. I have witnessed the lab across from work test his boundaries on several occasions. He has crossed the line several times and came on over to work. I will take his collar off and walk him back over the line and put his collar on. When they want something on the other side they go for it.

If you decide to get one then the ones like Jimmy has sounds like it would work best since you rent and would not have to put the wire in the ground and it could easily go with you when you move.

As several have stated good training is worth itweight in gold.