General housing help please

[AlMil]

Hello

I have adopted my sisters two beautiful bunnies. They were in a hutch that was far too small so we have made them their own enclosure. They have a good, draft proof/waterproof/cosy and dry hutch with a large run.
They have dug underground tunnels where they like to hide at times and I think great, they’re living how they would naturally in the wild. They have dug so much the enclosure is mostly dirt now with little grass. To be honest they didn’t eat or bother with the grass anyway.
Is this ok? Can they live mostly underground and with a muddy enclosure as opposed to a nice grassy one?
They are in great health and come bounding over for their treats/food everyday.

 

[Barn Yard Bunnies]

I think you only need to worry about them escaping or foxes getting in.

 

[tonibun]

Most people put slabs down to prevent digging out or foxes digging in. I prefer my Rabbits to be dry and sheltered especially at night as they are not as hardy as their wild counterparts. Are they eating hay as they need this to keep their teeth healthy?