If you're thinking of starting a farm.

1) Donkey rescue sanctuaries require you to have proper fencing, a field shelter, and some stables. They also require you to have stock wooden fencing, and dividing fences.

2) Moles are territorial. It's just one mole making all the moles hills in your garden, curiously they are also technically cannibals, and can eat their own young and or spouses (presumably,) because if their offspring grew up and then contested the same area of lawn it would be no different from an unrelated mole doing so.

3) llamas and Alpacas keep away foxes.

4) In order for a dog to be a good 'ratter' it must have been bitten by a rat itself.