How many feet of fencing needs to be covered?
and does the solution need to be aesthetically pleasing? If not, you might try some do it yourself solutions.
You might try tarps or tarpaulins to cover the first few feet of the fence. They are often used as coverings for carports in the wintertime. They are usually very solid and different companies will make them in different strengths. There probably exists a strength that will prevent a dog's nails from piercing the material. Just a thought.