When i started using the exercise pen I had to show my vaccination card- as the pen is only half an acre if that, the dogs really just need enough room to run around freely, with hardy throw toys and water supplied along with a gazebo and chairs. As the amount of poo is limited and cleared immediately worms etc should be a minimal problem and as the amount of land is relatively small it seems to me a good avenue of income , for a smallish initial outlay and few running costs. it would work as just a part of a smallholders overall activities ( I say as a wannabee not an actual smallholder) but even if you only have a few acres if half was allocated for the pen, there is still plenty of room for raising animals, I`d want an orchard and a meadow but really it`d fit in with most normal smallholder activities?