Good fence for large dogs?

We have two golden retrievers. We want them to have lots of room to play outdoors. So we are looking for ideas for fencing. The sides of our home is already fenced in. But we need the back fenced in. What's a good fence to get to keep them in thats not too expensive? And are there a lot of companies that... show more We have two golden retrievers. We want them to have lots of room to play outdoors. So we are looking for ideas for fencing. The sides of our home is already fenced in. But we need the back fenced in. What's a good fence to get to keep them in thats not too expensive? And are there a lot of companies that finance? Also, do you have to have a permit?
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