Theres always a risk but I prefer to take that risk to give my buns a few hours freedom.
We have a 6ft fence surrounding our garden with stones ontop of the soil. Im lucky enough that neither of my 2 are diggers. They are happy to lounge by the pond for a few hours and then head back into the hutch. They dont even eat the plants, just the grass. :shock:
Are you thinking about giving them free range occasionally when they are living outside?
Its a personal choice, I feel comfortable letting my 2 out & check on them every 15 mins. I wouldnt advise this to anyone but works for me & my 2.