The control of the Domestic Dog?

I'm a Lover of Dogs Overall,....But to my dismay a local hobby farmer in our district has had nothing but trouble with domestic dogs that have gone wild and venture out at night from a national park close by and have attacked their alpaches, and a about 60 sheep,in the last 6mths, This Guy has spent b,, ,ig Bucks on protective fencing, and is at wits end as these mongrels seem to have a continuous instinct to find a way in!,..I'm talking 2mtr fences with a barb across the top, and in the ground 600ml!...The only way these bastards are getting in is over the top, as we walked around and did close inspection today, theres nothing going underneath,.. incredible situation if these dogs are
capable of jumping better than 2.5 mtrs,...The local parks &wildlife have been involved, but have only had camera identification,a little trapping, andBlah .Blah.

When you pay inexcess of a million Dollars for your property, as a hobby farm its a frustrating thing to have this happen , ..So not sure what control needs to be looked at here,.. Different areas require different aproaches i think??,..But its Definitley a problem.

Cheers Axle