Hi guys - in serious research mode for getting some guinea pigs for the dses (aged 10 and 7) although I know realistically they'll be my pet and my responsibility 
One big concern I have though is a large part of our lawn used to be a veggie patch which was later grassed over. As a result, despite best efforts to dig them up, we get potatoes growing through. At the moment, we've just been mowing off the tops and ignoring them, but with piggies we're clearly going to be exposing them to potato leaves.
I've googled extensively but there seems to be mixed information whether the leaves themselves are poisonous. I know that you shouldn't give them potato peelings. Does anyone know for sure?