Well.. how big are your dogs? If they are large,, a taller fence might be in order... of they are shorter,, maybe something smaller is good enuff... I dont have a fence in my yard,, but in my next house,, we will for sure,, and it will be wood,,,,

any fence is gonna be pricey,, esp if it has to cover a large area..

Underground fence,, I have heard good and bad,,, personally,,, I wouldnt trust it! But thats just me.