That has to be frustrating especially if your dogs are getting hurt. Carl bought dog kennels for an area of our yard and using the house as one side has been able to make a fairly large area for them - would it be possible to buy a kennel and put it near that area using the fence as one side so your dogs can't get up to that part of the fence? It would be an inconvenience in mowing and in expense but it might help solve the problem - but that area might be too long for that idea too.