I have never known a piggy to eat radishes,bulb or leaves.I imagine they are too "peppery a taste for them".It would be interesting to know though if anyone has piggies who like radish.
To my knowledge they would be safe for the furries to eat.
Strange they do find them too hot though,because most o9f my pigs like peppers(green,red and yellow) and one or two will eat a small amount of watercress,but this is not very popular.
Mary