So I have 4 acres of green pasture with some trees fenced in. I plan on doing 3 hot wires to keep the goats and dogs from rubbing on the fence. I want to have my 16 chickens, 3 goats, 3 pigs (AGH so should be docile enough to not kill the chickens), and 2 live stock guardian dogs in this fence. I also plan to add a couple blackbelly sheep and geese/ducks. I can keep everyone out of the coop, but I have some concerns. I am new to farming, I only have experience with chickens and bees growing up, so this is all new to me. Will the pigs be able to destroy the 4 acres of grass? Is there any feed that would be dangerous for the others to consume? What are other concerns I'm not considering?