Waaaaaayyyyyyy cooooooooooooooool Mr. Nick!!!!!!!!!!!!!
I can already imagine the treadmill you're designing/planning to hook those behemoth canines up to. It probably will have a power-take-off so you can attach various contraptions including, but not limited too: mower decks, fence post augers, plows/tillers/cultivators, belt grinders (with a PTO drive extension to help prevent fur fires), generators, etc....
How much acreage do y'all have? Room for a bit of some healthy food cropping? How close is the nearest water for your eventual 300 plus pounds of furry water-loving friends?
Man it just makes my heart sing to know of your happiness and helps me walk with a lighter step as I tread this wonderful world!
All the best to you and yours, Phil