As far as I know any tree shavings that is from leafed trees are safe, anything from needled trees like pine shavings are harmfull. But if I where you I would look into paper bedding such as carefresh or über instead of wooden shavings. Wooden Shavings can be very dusty and cause respitory issues aswell as it doesnt hold tunnels that well. Paper bedsing is usually not very dusty, holds tunnels well and are more cosy
