Aluminum fences are good for dogs if the posts have anchors set in concrete and the border is at least 4' to 6' tall, depending on the size of the animal. Privacy fences help prevent dogs from becoming too distracted and barking at everything that comes by.
If your dog is prone to separation anxiety, then an ornamental aluminum fence with gaps between the pickets allows them more visibility to see you and calm them down. Also, consider installing a gravel border under the fence to discourage dogs from digging.