Is the wood kiln dried? Do you plan to paint it?
There's a house near me that just had a wooden fence installed, but it was installed by a fence company. It looks nice, but its unpainted and I'm not sure how it will age. This fence is about 6' tall. The tall fence overwhelms the small yard.
Another house near me installed a split rail fence and lined it with vinyl covered welded wire fencing for his dogs. The fence encloses his back yard and you barely notice the welded wire.
Have you considered an electric fence? I did a DIY electric fence that I bought at a big box store. It lasted longer than my dog.