I have a Pet Safe wireless for my black lab and it works great. He was a definite roamer and spent a lot of time in my neighbors pond and anywhere people were outside. Took me about an hour to set it up but after about two days he got the point. The down side is that the collar needs to be recharged about once every week or two BUT he now knows his boundaries and no longer leaves the yard (this is after about 3 months of wearing the collar). Cost of the system was about $300 but it was really really easy to set up.